165231331 has 4 divisors (see below), whose sum is σ = 165828112. Its totient is φ = 164634552.

The previous prime is 165231323. The next prime is 165231361. The reversal of 165231331 is 133132561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165231331 - 2³ = 165231323 is a prime.

It is a super-2 number, since 2×165231331² = 54602785488063122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165231296 and 165231305.

It is not an unprimeable number, because it can be changed into a prime (165231301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297975 + ... + 298528.

It is an arithmetic number, because the mean of its divisors is an integer number (41457028).

Almost surely, 2^165231331 is an apocalyptic number.

165231331 is a deficient number, since it is larger than the sum of its proper divisors (596781).

165231331 is an equidigital number, since it uses as much as digits as its factorization.

165231331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596780.

The product of its digits is 1620, while the sum is 25.

The square root of 165231331 is about 12854.2339717309. The cubic root of 165231331 is about 548.7368599479.

Adding to 165231331 its reverse (133132561), we get a palindrome (298363892).

The spelling of 165231331 in words is "one hundred sixty-five million, two hundred thirty-one thousand, three hundred thirty-one".