125016121 has 2 divisors, whose sum is σ = 125016122. Its totient is φ = 125016120.

The previous prime is 125016107. The next prime is 125016127. The reversal of 125016121 is 121610521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64176121 + 60840000 = 8011^2 + 7800^2 .

It is a cyclic number.

It is not a de Polignac number, because 125016121 - 2⁷ = 125015993 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (125016127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62508060 + 62508061.

It is an arithmetic number, because the mean of its divisors is an integer number (62508061).

Almost surely, 2^125016121 is an apocalyptic number.

It is an amenable number.

125016121 is a deficient number, since it is larger than the sum of its proper divisors (1).

125016121 is an equidigital number, since it uses as much as digits as its factorization.

125016121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 125016121 is about 11181.0608172928. The cubic root of 125016121 is about 500.0214937427.

Adding to 125016121 its reverse (121610521), we get a palindrome (246626642).

It can be divided in two parts, 1250 and 16121, that added together give a palindrome (17371).

The spelling of 125016121 in words is "one hundred twenty-five million, sixteen thousand, one hundred twenty-one".