231023520 has 576 divisors, whose sum is σ = 1017080064. Its totient is φ = 46448640.

The previous prime is 231023519. The next prime is 231023537. The reversal of 231023520 is 25320132.

231023520 is a `hidden beast` number, since 2 + 310 + 2 + 352 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231023493 and 231023502.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5372619 + ... + 5372661.

It is an arithmetic number, because the mean of its divisors is an integer number (1765764).

Almost surely, 2^231023520 is an apocalyptic number.

231023520 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 231023520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (508540032).

231023520 is an abundant number, since it is smaller than the sum of its proper divisors (786056544).

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

231023520 is a wasteful number, since it uses less digits than its factorization.

231023520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 231023520 is about 15199.4578850695. The cubic root of 231023520 is about 613.6000677671.

Adding to 231023520 its reverse (25320132), we get a palindrome (256343652).

The spelling of 231023520 in words is "two hundred thirty-one million, twenty-three thousand, five hundred twenty".