165017231 has 2 divisors, whose sum is σ = 165017232. Its totient is φ = 165017230.

The previous prime is 165017213. The next prime is 165017239. The reversal of 165017231 is 132710561.

Together with previous prime (165017213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (132710561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165017231 - 2²⁶ = 97908367 is a prime.

It is a super-2 number, since 2×165017231² = 54461373053814722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165017231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165017239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82508615 + 82508616.

It is an arithmetic number, because the mean of its divisors is an integer number (82508616).

Almost surely, 2^165017231 is an apocalyptic number.

165017231 is a deficient number, since it is larger than the sum of its proper divisors (1).

165017231 is an equidigital number, since it uses as much as digits as its factorization.

165017231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 165017231 is about 12845.9032769206. The cubic root of 165017231 is about 548.4997472457.

Adding to 165017231 its reverse (132710561), we get a palindrome (297727792).

It can be divided in two parts, 16501 and 7231, that added together give a palindrome (23732).

The spelling of 165017231 in words is "one hundred sixty-five million, seventeen thousand, two hundred thirty-one".