1251388887513 has 32 divisors (see below), whose sum is σ = 1797272064000. Its totient is φ = 771996226176.

The previous prime is 1251388887481. The next prime is 1251388887563. The reversal of 1251388887513 is 3157888831521.

It is not a de Polignac number, because 1251388887513 - 2⁵ = 1251388887481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1251388887563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 883213 + ... + 1811861.

It is an arithmetic number, because the mean of its divisors is an integer number (56164752000).

Almost surely, 2^{1251388887513} is an apocalyptic number.

It is an amenable number.

1251388887513 is a deficient number, since it is larger than the sum of its proper divisors (545883176487).

1251388887513 is a wasteful number, since it uses less digits than its factorization.

1251388887513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929221.

The product of its digits is 12902400, while the sum is 60.

The spelling of 1251388887513 in words is "one trillion, two hundred fifty-one billion, three hundred eighty-eight million, eight hundred eighty-seven thousand, five hundred thirteen".