125634121 has 4 divisors (see below), whose sum is σ = 125786500. Its totient is φ = 125481744.

The previous prime is 125634101. The next prime is 125634133. The reversal of 125634121 is 121436521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91470096 + 34164025 = 9564^2 + 5845^2 .

It is a cyclic number.

It is not a de Polignac number, because 125634121 - 2⁹ = 125633609 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125634101) 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, 74946 + ... + 76603.

It is an arithmetic number, because the mean of its divisors is an integer number (31446625).

Almost surely, 2^125634121 is an apocalyptic number.

It is an amenable number.

125634121 is a deficient number, since it is larger than the sum of its proper divisors (152379).

125634121 is an equidigital number, since it uses as much as digits as its factorization.

125634121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152378.

The product of its digits is 1440, while the sum is 25.

The square root of 125634121 is about 11208.6627659146. The cubic root of 125634121 is about 500.8440689600.

The spelling of 125634121 in words is "one hundred twenty-five million, six hundred thirty-four thousand, one hundred twenty-one".