231065520 has 160 divisors (see below), whose sum is σ = 829470720. Its totient is φ = 52116480.

The previous prime is 231065509. The next prime is 231065557. The reversal of 231065520 is 25560132.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131850 + ... + 133590.

It is an arithmetic number, because the mean of its divisors is an integer number (5184192).

Almost surely, 2^231065520 is an apocalyptic number.

231065520 is a gapful number since it is divisible by the number (20) 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 231065520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (414735360).

231065520 is an abundant number, since it is smaller than the sum of its proper divisors (598405200).

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

231065520 is a wasteful number, since it uses less digits than its factorization.

231065520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843 (or 1837 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 231065520 is about 15200.8394505040. The cubic root of 231065520 is about 613.6372496109.

The spelling of 231065520 in words is "two hundred thirty-one million, sixty-five thousand, five hundred twenty".