125113721 has 4 divisors (see below), whose sum is σ = 130553472. Its totient is φ = 119673972.

The previous prime is 125113717. The next prime is 125113733. The reversal of 125113721 is 127311521.

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 125113721 - 2² = 125113717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 5439727 = 125113721 / (1 + 2 + 5 + 1 + 1 + 3 + 7 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125113621) 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, 2719841 + ... + 2719886.

It is an arithmetic number, because the mean of its divisors is an integer number (32638368).

Almost surely, 2^125113721 is an apocalyptic number.

It is an amenable number.

125113721 is a deficient number, since it is larger than the sum of its proper divisors (5439751).

125113721 is an equidigital number, since it uses as much as digits as its factorization.

125113721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439750.

The product of its digits is 420, while the sum is 23.

The square root of 125113721 is about 11185.4244890393. The cubic root of 125113721 is about 500.1515820411.

The spelling of 125113721 in words is "one hundred twenty-five million, one hundred thirteen thousand, seven hundred twenty-one".