165897331 has 2 divisors, whose sum is σ = 165897332. Its totient is φ = 165897330.

The previous prime is 165897323. The next prime is 165897343. The reversal of 165897331 is 133798561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165897331 - 2³ = 165897323 is a prime.

It is a super-2 number, since 2×165897331² = 55043848865847122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165897031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82948665 + 82948666.

It is an arithmetic number, because the mean of its divisors is an integer number (82948666).

Almost surely, 2^165897331 is an apocalyptic number.

165897331 is a deficient number, since it is larger than the sum of its proper divisors (1).

165897331 is an equidigital number, since it uses as much as digits as its factorization.

165897331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 165897331 is about 12880.1137805533. The cubic root of 165897331 is about 549.4731384398.

It can be divided in two parts, 1658 and 97331, that added together give a palindrome (98989).

The spelling of 165897331 in words is "one hundred sixty-five million, eight hundred ninety-seven thousand, three hundred thirty-one".