1251313812500 has 42 divisors (see below), whose sum is σ = 2737214064774. Its totient is φ = 500525500000.

The previous prime is 1251313812461. The next prime is 1251313812521. The reversal of 1251313812500 is 52183131521.

It can be written as a sum of positive squares in 7 ways, for example, as 1245464928016 + 5848884484 = 1116004^2 + 76478^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 9948011 + ... + 10073010.

It is an arithmetic number, because the mean of its divisors is an integer number (65171763447).

Almost surely, 2^{1251313812500} is an apocalyptic number.

1251313812500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251313812500 is an abundant number, since it is smaller than the sum of its proper divisors (1485900252274).

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

1251313812500 is an frugal number, since it uses more digits than its factorization.

1251313812500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20021055 (or 20021028 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 1251313812500 in words is "one trillion, two hundred fifty-one billion, three hundred thirteen million, eight hundred twelve thousand, five hundred".