165939139 has 2 divisors, whose sum is σ = 165939140. Its totient is φ = 165939138.

The previous prime is 165939133. The next prime is 165939149. The reversal of 165939139 is 931939561.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165939139 is a prime.

It is a super-2 number, since 2×165939139² = 55071595704122642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165939133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82969569 + 82969570.

It is an arithmetic number, because the mean of its divisors is an integer number (82969570).

Almost surely, 2^165939139 is an apocalyptic number.

165939139 is a deficient number, since it is larger than the sum of its proper divisors (1).

165939139 is an equidigital number, since it uses as much as digits as its factorization.

165939139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196830, while the sum is 46.

The square root of 165939139 is about 12881.7366453441. The cubic root of 165939139 is about 549.5192923740.

The spelling of 165939139 in words is "one hundred sixty-five million, nine hundred thirty-nine thousand, one hundred thirty-nine".