231512064 has 144 divisors (see below), whose sum is σ = 718918200. Its totient is φ = 66060288.

The previous prime is 231512063. The next prime is 231512111. The reversal of 231512064 is 460215132.

231512064 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231512063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 300672 + ... + 301440.

Almost surely, 2^231512064 is an apocalyptic number.

231512064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231512064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (359459100).

231512064 is an abundant number, since it is smaller than the sum of its proper divisors (487406136).

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

231512064 is an equidigital number, since it uses as much as digits as its factorization.

231512064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 231512064 is about 15215.5204971766. The cubic root of 231512064 is about 614.0322886534.

Adding to 231512064 its reverse (460215132), we get a palindrome (691727196).

The spelling of 231512064 in words is "two hundred thirty-one million, five hundred twelve thousand, sixty-four".