165212631 has 18 divisors (see below), whose sum is σ = 241249632. Its totient is φ = 108950400.

The previous prime is 165212629. The next prime is 165212639. The reversal of 165212631 is 136212561.

165212631 is a `hidden beast` number, since 1 + 6 + 5 + 21 + 2 + 631 = 666.

It is not a de Polignac number, because 165212631 - 2¹ = 165212629 is a prime.

It is a super-2 number, since 2×165212631² = 54590426883884322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165212595 and 165212604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165212639) 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 17 ways as a sum of consecutive naturals, for example, 83706 + ... + 85656.

Almost surely, 2^165212631 is an apocalyptic number.

165212631 is a deficient number, since it is larger than the sum of its proper divisors (76037001).

165212631 is an equidigital number, since it uses as much as digits as its factorization.

165212631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151 (or 2051 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 165212631 is about 12853.5065643582. The cubic root of 165212631 is about 548.7161581308.

The spelling of 165212631 in words is "one hundred sixty-five million, two hundred twelve thousand, six hundred thirty-one".