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1018081 = 10092
BaseRepresentation
bin11111000100011100001
31220201112201
43320203201
5230034311
633453201
711440111
oct3704341
91821481
101018081
11635999
12411201
1329851c
141c7041
151519c1
hexf88e1

1018081 has 3 divisors (see below), whose sum is σ = 1019091. Its totient is φ = 1017072.

The previous prime is 1018057. The next prime is 1018091. The reversal of 1018081 is 1808101.

The square root of 1018081 is 1009.

It is a perfect power (a square), and thus also a powerful number.

1018081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1808101 = 6129641.

It can be written as a sum of positive squares in only one way, i.e., 312481 + 705600 = 559^2 + 840^2 .

It is not a de Polignac number, because 1018081 - 27 = 1017953 is a prime.

It is a super-2 number, since 2×10180812 = 2072977845122, which contains 22 as substring.

It is a Duffinian number.

1018081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1018021) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 505 + ... + 1513.

It is an arithmetic number, because the mean of its divisors is an integer number (339697).

21018081 is an apocalyptic number.

1018081 is the 1009-th square number.

1018081 is the 505-th centered octagonal number.

It is an amenable number.

1018081 is a deficient number, since it is larger than the sum of its proper divisors (1010).

1018081 is an frugal number, since it uses more digits than its factorization.

1018081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018 (or 1009 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

The cubic root of 1018081 is about 100.5991035812.

Multiplying 1018081 by its product of nonzero digits (64), we get a square (65157184 = 80722).

The spelling of 1018081 in words is "one million, eighteen thousand, eighty-one".

Divisors: 1 1009 1018081