231181140969 has 27 divisors (see below), whose sum is σ = 335685574263. Its totient is φ = 153313956432.

The previous prime is 231181140961. The next prime is 231181140973. The reversal of 231181140969 is 969041181132.

The square root of 231181140969 is 480813.

It is a perfect power (a square), and thus also a powerful number.

231181140969 is a `hidden beast` number, since 2 + 3 + 1 + 181 + 1 + 409 + 69 = 666.

It can be written as a sum of positive squares in only one way, i.e., 218729259225 + 12451881744 = 467685^2 + 111588^2 .

It is not a de Polignac number, because 231181140969 - 2³ = 231181140961 is a prime.

It is a super-2 number, since 2×231181140969² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231181140961) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 422634354 + ... + 422634900.

Almost surely, 2^231181140969 is an apocalyptic number.

231181140969 is the 480813-rd square number.

231181140969 is the 240407-th centered octagonal number.

It is an amenable number.

231181140969 is a deficient number, since it is larger than the sum of its proper divisors (104504433294).

231181140969 is an frugal number, since it uses more digits than its factorization.

231181140969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686 (or 843 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 231181140969 in words is "two hundred thirty-one billion, one hundred eighty-one million, one hundred forty thousand, nine hundred sixty-nine".