231231965 has 8 divisors (see below), whose sum is σ = 277563480. Its totient is φ = 184928832.

The previous prime is 231231947. The next prime is 231231971. The reversal of 231231965 is 569132132.

It can be written as a sum of positive squares in 4 ways, for example, as 36517849 + 194714116 = 6043^2 + 13954^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 231231965 - 2⁶ = 231231901 is a prime.

It is a super-2 number, since 2×231231965² = 106936443275522450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20831 + ... + 29939.

It is an arithmetic number, because the mean of its divisors is an integer number (34695435).

Almost surely, 2^231231965 is an apocalyptic number.

It is an amenable number.

231231965 is a deficient number, since it is larger than the sum of its proper divisors (46331515).

231231965 is an equidigital number, since it uses as much as digits as its factorization.

231231965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14191.

The product of its digits is 9720, while the sum is 32.

The square root of 231231965 is about 15206.3133270362. The cubic root of 231231965 is about 613.7845560798.

The spelling of 231231965 in words is "two hundred thirty-one million, two hundred thirty-one thousand, nine hundred sixty-five".