231611264 has 64 divisors (see below), whose sum is σ = 492305040. Its totient is φ = 108158976.

The previous prime is 231611257. The next prime is 231611269. The reversal of 231611264 is 462116132.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×231611264² = 107287555223355392, which contains 22 as substring.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231611269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354362 + ... + 355014.

Almost surely, 2^231611264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231611264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246152520).

231611264 is an abundant number, since it is smaller than the sum of its proper divisors (260693776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231611264 is a wasteful number, since it uses less digits than its factorization.

231611264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847 (or 835 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 231611264 is about 15218.7799773832. The cubic root of 231611264 is about 614.1199778276.

Adding to 231611264 its reverse (462116132), we get a palindrome (693727396).

The spelling of 231611264 in words is "two hundred thirty-one million, six hundred eleven thousand, two hundred sixty-four".