125315513521 has 12 divisors (see below), whose sum is σ = 138026404096. Its totient is φ = 113689212120.

The previous prime is 125315513483. The next prime is 125315513539.

It is a happy number.

125315513521 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 125315513521 - 2¹¹ = 125315511473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125315513621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1004385 + ... + 1122238.

Almost surely, 2^125315513521 is an apocalyptic number.

125315513521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125315513521 is a deficient number, since it is larger than the sum of its proper divisors (12710890575).

125315513521 is a wasteful number, since it uses less digits than its factorization.

125315513521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127132 (or 2127121 counting only the distinct ones).

The product of its digits is 22500, while the sum is 34.

It can be divided in two parts, 125315 and 513521, that added together give a palindrome (638836).

The spelling of 125315513521 in words is "one hundred twenty-five billion, three hundred fifteen million, five hundred thirteen thousand, five hundred twenty-one".