165531539 has 2 divisors, whose sum is σ = 165531540. Its totient is φ = 165531538.

The previous prime is 165531523. The next prime is 165531547. The reversal of 165531539 is 935135561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165531539 - 2⁴ = 165531523 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165531589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82765769 + 82765770.

It is an arithmetic number, because the mean of its divisors is an integer number (82765770).

Almost surely, 2^165531539 is an apocalyptic number.

165531539 is a deficient number, since it is larger than the sum of its proper divisors (1).

165531539 is an equidigital number, since it uses as much as digits as its factorization.

165531539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60750, while the sum is 38.

The square root of 165531539 is about 12865.9060699198. The cubic root of 165531539 is about 549.0689913219.

The spelling of 165531539 in words is "one hundred sixty-five million, five hundred thirty-one thousand, five hundred thirty-nine".