165195431 has 2 divisors, whose sum is σ = 165195432. Its totient is φ = 165195430.

The previous prime is 165195419. The next prime is 165195449. The reversal of 165195431 is 134591561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165195431 - 2²⁶ = 98086567 is a prime.

It is a super-2 number, since 2×165195431² = 54579060846551522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 165195391 and 165195400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165195031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82597715 + 82597716.

It is an arithmetic number, because the mean of its divisors is an integer number (82597716).

Almost surely, 2^165195431 is an apocalyptic number.

165195431 is a deficient number, since it is larger than the sum of its proper divisors (1).

165195431 is an equidigital number, since it uses as much as digits as its factorization.

165195431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 35.

The square root of 165195431 is about 12852.8374688238. The cubic root of 165195431 is about 548.6971155079.

The spelling of 165195431 in words is "one hundred sixty-five million, one hundred ninety-five thousand, four hundred thirty-one".