231313664 has 18 divisors (see below), whose sum is σ = 461724270. Its totient is φ = 115656704.

The previous prime is 231313639. The next prime is 231313699. The reversal of 231313664 is 466313132.

It can be written as a sum of positive squares in only one way, i.e., 224760064 + 6553600 = 14992^2 + 2560^2 .

It is a super-2 number, since 2×231313664² = 107012022306209792, which contains 22 as substring.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 451529 + ... + 452040.

Almost surely, 2^231313664 is an apocalyptic number.

It is an amenable number.

231313664 is a deficient number, since it is larger than the sum of its proper divisors (230410606).

231313664 is an frugal number, since it uses more digits than its factorization.

231313664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903585 (or 903571 counting only the distinct ones).

The product of its digits is 7776, while the sum is 29.

The square root of 231313664 is about 15208.9994411204. Note that the first 3 decimals coincide. The cubic root of 231313664 is about 613.8568351291.

Adding to 231313664 its reverse (466313132), we get a palindrome (697626796).

The spelling of 231313664 in words is "two hundred thirty-one million, three hundred thirteen thousand, six hundred sixty-four".