165251031 has 12 divisors (see below), whose sum is σ = 242186616. Its totient is φ = 100151920.

The previous prime is 165251027. The next prime is 165251041. The reversal of 165251031 is 130152561.

It is not a de Polignac number, because 165251031 - 2² = 165251027 is a prime.

It is a super-2 number, since 2×165251031² = 54615806493125922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165250992 and 165251010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165251041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 227256 + ... + 227981.

It is an arithmetic number, because the mean of its divisors is an integer number (20182218).

Almost surely, 2^165251031 is an apocalyptic number.

165251031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165251031 is a deficient number, since it is larger than the sum of its proper divisors (76935585).

165251031 is a wasteful number, since it uses less digits than its factorization.

165251031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455262 (or 455251 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 165251031 is about 12855.0002333722. Note that the first 3 decimals coincide. The cubic root of 165251031 is about 548.7586671248.

The spelling of 165251031 in words is "one hundred sixty-five million, two hundred fifty-one thousand, thirty-one".