165490431 has 16 divisors (see below), whose sum is σ = 232624128. Its totient is φ = 104493600.

The previous prime is 165490417. The next prime is 165490447. The reversal of 165490431 is 134094561.

It is a de Polignac number, because none of the positive numbers 2^k-165490431 is a prime.

It is a super-2 number, since 2×165490431² = 54774165505131522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165490392 and 165490401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165490471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14560 + ... + 23301.

It is an arithmetic number, because the mean of its divisors is an integer number (14539008).

Almost surely, 2^165490431 is an apocalyptic number.

165490431 is a deficient number, since it is larger than the sum of its proper divisors (67133697).

165490431 is a wasteful number, since it uses less digits than its factorization.

165490431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37942.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 165490431 is about 12864.3084151461. The cubic root of 165490431 is about 549.0235357410.

The spelling of 165490431 in words is "one hundred sixty-five million, four hundred ninety thousand, four hundred thirty-one".