231515451254020 has 24 divisors (see below), whose sum is σ = 486521723651544. Its totient is φ = 92541556498176.

The previous prime is 231515451253969. The next prime is 231515451254033. The reversal of 231515451254020 is 20452154515132.

It can be written as a sum of positive squares in 4 ways, for example, as 2956205687044 + 228559245566976 = 1719362^2 + 15118176^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4038970839 + ... + 4039028158.

It is an arithmetic number, because the mean of its divisors is an integer number (20271738485481).

Almost surely, 2^{231515451254020} is an apocalyptic number.

231515451254020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231515451254020 is an abundant number, since it is smaller than the sum of its proper divisors (255006272397524).

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

231515451254020 is a wasteful number, since it uses less digits than its factorization.

231515451254020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8078000439 (or 8078000437 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 231515451254020 in words is "two hundred thirty-one trillion, five hundred fifteen billion, four hundred fifty-one million, two hundred fifty-four thousand, twenty".