231211564 has 12 divisors (see below), whose sum is σ = 404903464. Its totient is φ = 115524864.

The previous prime is 231211553. The next prime is 231211567. The reversal of 231211564 is 465112132.

It is a happy number.

231211564 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×231211564³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (231211567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13557 + ... + 25420.

Almost surely, 2^231211564 is an apocalyptic number.

It is an amenable number.

231211564 is a deficient number, since it is larger than the sum of its proper divisors (173691900).

231211564 is a wasteful number, since it uses less digits than its factorization.

231211564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40464 (or 40462 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 231211564 is about 15205.6425053333. The cubic root of 231211564 is about 613.7665046727.

Adding to 231211564 its reverse (465112132), we get a palindrome (696323696).

The spelling of 231211564 in words is "two hundred thirty-one million, two hundred eleven thousand, five hundred sixty-four".