165312231 has 24 divisors (see below), whose sum is σ = 256978800. Its totient is φ = 94252032.

The previous prime is 165312229. The next prime is 165312241. The reversal of 165312231 is 132213561.

It is not a de Polignac number, because 165312231 - 2¹ = 165312229 is a prime.

It is a super-2 number, since 2×165312231² = 54656267436394722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165312241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83845 + ... + 85793.

It is an arithmetic number, because the mean of its divisors is an integer number (10707450).

Almost surely, 2^165312231 is an apocalyptic number.

165312231 is a deficient number, since it is larger than the sum of its proper divisors (91666569).

165312231 is a wasteful number, since it uses less digits than its factorization.

165312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543 (or 2536 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 165312231 is about 12857.3804097102. The cubic root of 165312231 is about 548.8264022249.

Adding to 165312231 its reverse (132213561), we get a palindrome (297525792).

The spelling of 165312231 in words is "one hundred sixty-five million, three hundred twelve thousand, two hundred thirty-one".