231551431454520 has 256 divisors, whose sum is σ = 788675176396800. Its totient is φ = 60401465971200.

The previous prime is 231551431454507. The next prime is 231551431454587. The reversal of 231551431454520 is 25454134155132.

231551431454520 is a `hidden beast` number, since 2 + 3 + 1 + 5 + 5 + 143 + 1 + 454 + 52 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 95294947 + ... + 97694573.

It is an arithmetic number, because the mean of its divisors is an integer number (3080762407800).

Almost surely, 2^{231551431454520} is an apocalyptic number.

231551431454520 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 231551431454520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394337588198400).

231551431454520 is an abundant number, since it is smaller than the sum of its proper divisors (557123744942280).

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

231551431454520 is a wasteful number, since it uses less digits than its factorization.

231551431454520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401595 (or 2401585 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 45.

The spelling of 231551431454520 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, four hundred thirty-one million, four hundred fifty-four thousand, five hundred twenty".