1231357363520 has 56 divisors (see below), whose sum is σ = 2938941807144. Its totient is φ = 491405377536.

The previous prime is 1231357363469. The next prime is 1231357363541. The reversal of 1231357363520 is 253637531321.

It can be written as a sum of positive squares in 4 ways, for example, as 23099136256 + 1208258227264 = 151984^2 + 1099208^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4304849 + ... + 4581968.

It is an arithmetic number, because the mean of its divisors is an integer number (52481103699).

Almost surely, 2^{1231357363520} is an apocalyptic number.

1231357363520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231357363520 is an abundant number, since it is smaller than the sum of its proper divisors (1707584443624).

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

1231357363520 is an equidigital number, since it uses as much as digits as its factorization.

1231357363520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8887267 (or 8887257 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 41.

The spelling of 1231357363520 in words is "one trillion, two hundred thirty-one billion, three hundred fifty-seven million, three hundred sixty-three thousand, five hundred twenty".