125516513 has 4 divisors (see below), whose sum is σ = 126504960. Its totient is φ = 124528068.

The previous prime is 125516509. The next prime is 125516533. The reversal of 125516513 is 315615521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125516513 - 2² = 125516509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125516533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494033 + ... + 494286.

It is an arithmetic number, because the mean of its divisors is an integer number (31626240).

Almost surely, 2^125516513 is an apocalyptic number.

It is an amenable number.

125516513 is a deficient number, since it is larger than the sum of its proper divisors (988447).

125516513 is an equidigital number, since it uses as much as digits as its factorization.

125516513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988446.

The product of its digits is 4500, while the sum is 29.

The square root of 125516513 is about 11203.4152382209. The cubic root of 125516513 is about 500.6877376003.

The spelling of 125516513 in words is "one hundred twenty-five million, five hundred sixteen thousand, five hundred thirteen".