231194965 has 16 divisors (see below), whose sum is σ = 290793600. Its totient is φ = 176121792.

The previous prime is 231194963. The next prime is 231194969. The reversal of 231194965 is 569491132.

It is a 3-Lehmer number, since φ(231194965) divides (231194965-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 231194965 - 2¹ = 231194963 is a prime.

It is a super-2 number, since 2×231194965² = 106902223682702450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231194963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21946 + ... + 30724.

It is an arithmetic number, because the mean of its divisors is an integer number (18174600).

It is a Poulet number, since it divides 2^231194964-1.

Almost surely, 2^231194965 is an apocalyptic number.

231194965 is the 8779-th octagonal number.

It is an amenable number.

231194965 is a deficient number, since it is larger than the sum of its proper divisors (59598635).

231194965 is a wasteful number, since it uses less digits than its factorization.

231194965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9036.

The product of its digits is 58320, while the sum is 40.

The square root of 231194965 is about 15205.0966784167. The cubic root of 231194965 is about 613.7518166040.

The spelling of 231194965 in words is "two hundred thirty-one million, one hundred ninety-four thousand, nine hundred sixty-five".