125440517 has 4 divisors (see below), whose sum is σ = 125465760. Its totient is φ = 125415276.

The previous prime is 125440493. The next prime is 125440519. The reversal of 125440517 is 715044521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 715044521 = 97 ⋅7371593.

It is a cyclic number.

It is not a de Polignac number, because 125440517 - 2²⁴ = 108663301 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 125440517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125440519) 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, 2417 + ... + 16022.

It is an arithmetic number, because the mean of its divisors is an integer number (31366440).

Almost surely, 2^125440517 is an apocalyptic number.

It is an amenable number.

125440517 is a deficient number, since it is larger than the sum of its proper divisors (25243).

125440517 is an equidigital number, since it uses as much as digits as its factorization.

125440517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25242.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 125440517 is about 11200.0230803334. The cubic root of 125440517 is about 500.5866673736.

The spelling of 125440517 in words is "one hundred twenty-five million, four hundred forty thousand, five hundred seventeen".