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2081641 = 3535897
BaseRepresentation
bin111111100001101101001
310220202110211
413330031221
51013103031
6112341121
723456632
oct7741551
93822424
102081641
1111a1a71
128447a1
1357b653
143c2889
152b1bb1
hex1fc369

2081641 has 4 divisors (see below), whose sum is σ = 2087892. Its totient is φ = 2075392.

The previous prime is 2081627. The next prime is 2081647. The reversal of 2081641 is 1461802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1461802 = 2730901.

It can be written as a sum of positive squares in 2 ways, for example, as 1449616 + 632025 = 1204^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081641 - 25 = 2081609 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2081647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2596 + ... + 3301.

It is an arithmetic number, because the mean of its divisors is an integer number (521973).

22081641 is an apocalyptic number.

2081641 is the 913-rd centered pentagonal number.

It is an amenable number.

2081641 is a deficient number, since it is larger than the sum of its proper divisors (6251).

2081641 is an equidigital number, since it uses as much as digits as its factorization.

2081641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6250.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 2081641 is about 1442.7893124084. The cubic root of 2081641 is about 127.6836466707.

It can be divided in two parts, 208 and 1641, that added together give a square (1849 = 432).

The spelling of 2081641 in words is "two million, eighty-one thousand, six hundred forty-one".

Divisors: 1 353 5897 2081641