125525521 has 6 divisors (see below), whose sum is σ = 137974466. Its totient is φ = 114114000.

The previous prime is 125525489. The next prime is 125525531.

125525521 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 78411025 + 47114496 = 8855^2 + 6864^2 .

It is not a de Polignac number, because 125525521 - 2⁵ = 125525489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125525521.

It is not an unprimeable number, because it can be changed into a prime (125525531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 518580 + ... + 518821.

Almost surely, 2^125525521 is an apocalyptic number.

125525521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125525521 is a deficient number, since it is larger than the sum of its proper divisors (12448945).

125525521 is a wasteful number, since it uses less digits than its factorization.

125525521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037423 (or 1037412 counting only the distinct ones).

The product of its digits is 5000, while the sum is 28.

The square root of 125525521 is about 11203.8172512765. The cubic root of 125525521 is about 500.6997150077.

The spelling of 125525521 in words is "one hundred twenty-five million, five hundred twenty-five thousand, five hundred twenty-one".