165397231 has 2 divisors, whose sum is σ = 165397232. Its totient is φ = 165397230.

The previous prime is 165397217. The next prime is 165397247. The reversal of 165397231 is 132793561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165397231 - 2⁷ = 165397103 is a prime.

It is a super-2 number, since 2×165397231² = 54712488044934722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165397031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82698615 + 82698616.

It is an arithmetic number, because the mean of its divisors is an integer number (82698616).

Almost surely, 2^165397231 is an apocalyptic number.

165397231 is a deficient number, since it is larger than the sum of its proper divisors (1).

165397231 is an equidigital number, since it uses as much as digits as its factorization.

165397231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 37.

The square root of 165397231 is about 12860.6854793981. The cubic root of 165397231 is about 548.9204510251.

The spelling of 165397231 in words is "one hundred sixty-five million, three hundred ninety-seven thousand, two hundred thirty-one".