165587131 has 2 divisors, whose sum is σ = 165587132. Its totient is φ = 165587130.

The previous prime is 165587119. The next prime is 165587153. The reversal of 165587131 is 131785561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165587131 - 2²³ = 157198523 is a prime.

It is a super-2 number, since 2×165587131² = 54838195905622322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165587231) 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, 82793565 + 82793566.

It is an arithmetic number, because the mean of its divisors is an integer number (82793566).

Almost surely, 2^165587131 is an apocalyptic number.

165587131 is a deficient number, since it is larger than the sum of its proper divisors (1).

165587131 is an equidigital number, since it uses as much as digits as its factorization.

165587131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 37.

The square root of 165587131 is about 12868.0663271527. The cubic root of 165587131 is about 549.1304507617.

The spelling of 165587131 in words is "one hundred sixty-five million, five hundred eighty-seven thousand, one hundred thirty-one".