165531523 has 2 divisors, whose sum is σ = 165531524. Its totient is φ = 165531522.

The previous prime is 165531517. The next prime is 165531539. The reversal of 165531523 is 325135561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165531523 - 2¹⁷ = 165400451 is a prime.

It is not a weakly prime, because it can be changed into another prime (165531593) 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, 82765761 + 82765762.

It is an arithmetic number, because the mean of its divisors is an integer number (82765762).

Almost surely, 2^165531523 is an apocalyptic number.

165531523 is a deficient number, since it is larger than the sum of its proper divisors (1).

165531523 is an equidigital number, since it uses as much as digits as its factorization.

165531523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13500, while the sum is 31.

The square root of 165531523 is about 12865.9054481214. The cubic root of 165531523 is about 549.0689736312.

The spelling of 165531523 in words is "one hundred sixty-five million, five hundred thirty-one thousand, five hundred twenty-three".