231135969 has 16 divisors (see below), whose sum is σ = 334868480. Its totient is φ = 141270480.

The previous prime is 231135959. The next prime is 231136019. The reversal of 231135969 is 969531132.

It is not a de Polignac number, because 231135969 - 2⁴ = 231135953 is a prime.

It is a super-2 number, since 2×231135969² = 106847672331137922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231135959) 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, 63637 + ... + 67170.

It is an arithmetic number, because the mean of its divisors is an integer number (20929280).

Almost surely, 2^231135969 is an apocalyptic number.

It is an amenable number.

231135969 is a deficient number, since it is larger than the sum of its proper divisors (103732511).

231135969 is a wasteful number, since it uses less digits than its factorization.

231135969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130860.

The product of its digits is 43740, while the sum is 39.

The square root of 231135969 is about 15203.1565472437. The cubic root of 231135969 is about 613.6996067263.

The spelling of 231135969 in words is "two hundred thirty-one million, one hundred thirty-five thousand, nine hundred sixty-nine".