125125513 has 4 divisors (see below), whose sum is σ = 125644948. Its totient is φ = 124606080.

The previous prime is 125125487. The next prime is 125125531. The reversal of 125125513 is 315521521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31945104 + 93180409 = 5652^2 + 9653^2 .

It is a cyclic number.

It is not a de Polignac number, because 125125513 - 2⁹ = 125125001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125125573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259356 + ... + 259837.

It is an arithmetic number, because the mean of its divisors is an integer number (31411237).

Almost surely, 2^125125513 is an apocalyptic number.

It is an amenable number.

125125513 is a deficient number, since it is larger than the sum of its proper divisors (519435).

125125513 is an equidigital number, since it uses as much as digits as its factorization.

125125513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519434.

The product of its digits is 1500, while the sum is 25.

The square root of 125125513 is about 11185.9515911701. The cubic root of 125125513 is about 500.1672946854.

The spelling of 125125513 in words is "one hundred twenty-five million, one hundred twenty-five thousand, five hundred thirteen".