125520257 has 4 divisors (see below), whose sum is σ = 125662656. Its totient is φ = 125377860.

The previous prime is 125520247. The next prime is 125520259. The reversal of 125520257 is 752025521.

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 125520257 - 2²⁶ = 58411393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125520259) 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, 69869 + ... + 71642.

It is an arithmetic number, because the mean of its divisors is an integer number (31415664).

Almost surely, 2^125520257 is an apocalyptic number.

It is an amenable number.

125520257 is a deficient number, since it is larger than the sum of its proper divisors (142399).

125520257 is an equidigital number, since it uses as much as digits as its factorization.

125520257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142398.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 125520257 is about 11203.5823288803. The cubic root of 125520257 is about 500.6927158463.

Adding to 125520257 its reverse (752025521), we get a palindrome (877545778).

It can be divided in two parts, 1255 and 20257, that added together give a palindrome (21512).

The spelling of 125520257 in words is "one hundred twenty-five million, five hundred twenty thousand, two hundred fifty-seven".