125404121 has 4 divisors (see below), whose sum is σ = 132780852. Its totient is φ = 118027392.

The previous prime is 125404061. The next prime is 125404127. The reversal of 125404121 is 121404521.

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 66667225 + 58736896 = 8165^2 + 7664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125404121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125404093 and 125404102.

It is not an unprimeable number, because it can be changed into a prime (125404127) 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, 3688340 + ... + 3688373.

It is an arithmetic number, because the mean of its divisors is an integer number (33195213).

Almost surely, 2^125404121 is an apocalyptic number.

It is an amenable number.

125404121 is a deficient number, since it is larger than the sum of its proper divisors (7376731).

125404121 is an equidigital number, since it uses as much as digits as its factorization.

125404121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7376730.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 125404121 is about 11198.3981443776. The cubic root of 125404121 is about 500.5382483695.

Adding to 125404121 its reverse (121404521), we get a palindrome (246808642).

It can be divided in two parts, 12540 and 4121, that added together give a palindrome (16661).

The spelling of 125404121 in words is "one hundred twenty-five million, four hundred four thousand, one hundred twenty-one".