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1009021 = 1377617
BaseRepresentation
bin11110110010101111101
31220021010011
43312111331
5224242041
633343221
711401516
oct3662575
91807104
101009021
1162a102
12407b11
13294370
141c3a0d
1514de81
hexf657d

1009021 has 4 divisors (see below), whose sum is σ = 1086652. Its totient is φ = 931392.

The previous prime is 1009007. The next prime is 1009037. The reversal of 1009021 is 1209001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1209001 = 7271663.

It can be written as a sum of positive squares in 2 ways, for example, as 376996 + 632025 = 614^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009021 - 25 = 1008989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 77617 = 1009021 / (1 + 0 + 0 + 9 + 0 + 2 + 1).

It is the 1005-th Hogben number.

It is a Duffinian number.

1009021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1008992 and 1009010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009061) by changing a digit.

It is a nontrivial repunit in base 1004.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38796 + ... + 38821.

It is an arithmetic number, because the mean of its divisors is an integer number (271663).

21009021 is an apocalyptic number.

It is an amenable number.

1009021 is a deficient number, since it is larger than the sum of its proper divisors (77631).

1009021 is an equidigital number, since it uses as much as digits as its factorization.

1009021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77630.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1009021 is about 1004.5003733200. The cubic root of 1009021 is about 100.2998002996.

The spelling of 1009021 in words is "one million, nine thousand, twenty-one".

Divisors: 1 13 77617 1009021