231275520 has 352 divisors, whose sum is σ = 943257600. Its totient is φ = 52641792.

The previous prime is 231275503. The next prime is 231275533. The reversal of 231275520 is 25572132.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 12.

It is a congruent number.

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, 967561 + ... + 967799.

Almost surely, 2^231275520 is an apocalyptic number.

231275520 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 231275520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (471628800).

231275520 is an abundant number, since it is smaller than the sum of its proper divisors (711982080).

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

231275520 is a wasteful number, since it uses less digits than its factorization.

231275520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 231275520 is about 15207.7453950282. The cubic root of 231275520 is about 613.8230912768.

The spelling of 231275520 in words is "two hundred thirty-one million, two hundred seventy-five thousand, five hundred twenty".