165490331 has 2 divisors, whose sum is σ = 165490332. Its totient is φ = 165490330.

The previous prime is 165490301. The next prime is 165490349. The reversal of 165490331 is 133094561.

It is a strong prime.

It is an emirp because it is prime and its reverse (133094561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165490331 is a prime.

It is a super-2 number, since 2×165490331² = 54774099308979122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165490301) 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, 82745165 + 82745166.

It is an arithmetic number, because the mean of its divisors is an integer number (82745166).

Almost surely, 2^165490331 is an apocalyptic number.

165490331 is a deficient number, since it is larger than the sum of its proper divisors (1).

165490331 is an equidigital number, since it uses as much as digits as its factorization.

165490331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 165490331 is about 12864.3045284228. The cubic root of 165490331 is about 549.0234251559.

The spelling of 165490331 in words is "one hundred sixty-five million, four hundred ninety thousand, three hundred thirty-one".