125765221 has 4 divisors (see below), whose sum is σ = 126468000. Its totient is φ = 125062444.

The previous prime is 125765209. The next prime is 125765243. The reversal of 125765221 is 122567521.

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: 122567521 = 31 ⋅3953791.

It is a cyclic number.

It is not a de Polignac number, because 125765221 - 2⁷ = 125765093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125765021) 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, 351121 + ... + 351478.

It is an arithmetic number, because the mean of its divisors is an integer number (31617000).

Almost surely, 2^125765221 is an apocalyptic number.

It is an amenable number.

125765221 is a deficient number, since it is larger than the sum of its proper divisors (702779).

125765221 is an equidigital number, since it uses as much as digits as its factorization.

125765221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702778.

The product of its digits is 8400, while the sum is 31.

The square root of 125765221 is about 11214.5093963133. The cubic root of 125765221 is about 501.0182197163.

The spelling of 125765221 in words is "one hundred twenty-five million, seven hundred sixty-five thousand, two hundred twenty-one".