231665331 has 8 divisors (see below), whose sum is σ = 310236880. Its totient is φ = 153768672.

The previous prime is 231665327. The next prime is 231665333. The reversal of 231665331 is 133566132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231665331 - 2² = 231665327 is a prime.

It is a super-2 number, since 2×231665331² = 107337651174679122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231665333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167920 + ... + 169293.

It is an arithmetic number, because the mean of its divisors is an integer number (38779610).

Almost surely, 2^231665331 is an apocalyptic number.

231665331 is a deficient number, since it is larger than the sum of its proper divisors (78571549).

231665331 is a wasteful number, since it uses less digits than its factorization.

231665331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337445.

The product of its digits is 9720, while the sum is 30.

The square root of 231665331 is about 15220.5561987728. The cubic root of 231665331 is about 614.1677605375.

The spelling of 231665331 in words is "two hundred thirty-one million, six hundred sixty-five thousand, three hundred thirty-one".