165207631 has 2 divisors, whose sum is σ = 165207632. Its totient is φ = 165207630.

The previous prime is 165207629. The next prime is 165207667. The reversal of 165207631 is 136702561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165207631 - 2¹ = 165207629 is a prime.

It is a super-2 number, since 2×165207631² = 54587122681264322, which contains 22 as substring.

Together with 165207629, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 165207593 and 165207602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165207671) 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 as a sum of consecutive naturals, namely, 82603815 + 82603816.

It is an arithmetic number, because the mean of its divisors is an integer number (82603816).

Almost surely, 2^165207631 is an apocalyptic number.

165207631 is a deficient number, since it is larger than the sum of its proper divisors (1).

165207631 is an equidigital number, since it uses as much as digits as its factorization.

165207631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 165207631 is about 12853.3120634333. The cubic root of 165207631 is about 548.7106226209.

The spelling of 165207631 in words is "one hundred sixty-five million, two hundred seven thousand, six hundred thirty-one".