125923921 has 4 divisors (see below), whose sum is σ = 126025200. Its totient is φ = 125822644.

The previous prime is 125923907. The next prime is 125923933. The reversal of 125923921 is 129329521.

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 125923921 - 2⁷ = 125923793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125923901) 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, 48751 + ... + 51268.

It is an arithmetic number, because the mean of its divisors is an integer number (31506300).

Almost surely, 2^125923921 is an apocalyptic number.

It is an amenable number.

125923921 is a deficient number, since it is larger than the sum of its proper divisors (101279).

125923921 is a wasteful number, since it uses less digits than its factorization.

125923921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101278.

The product of its digits is 9720, while the sum is 34.

The square root of 125923921 is about 11221.5828206185. The cubic root of 125923921 is about 501.2288719398.

The spelling of 125923921 in words is "one hundred twenty-five million, nine hundred twenty-three thousand, nine hundred twenty-one".