125121057 has 4 divisors (see below), whose sum is σ = 166828080. Its totient is φ = 83414036.

The previous prime is 125121019. The next prime is 125121067. The reversal of 125121057 is 750121521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 750121521 = 3 ⋅250040507.

It is a cyclic number.

It is not a de Polignac number, because 125121057 - 2²⁶ = 58012193 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (125121067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20853507 + ... + 20853512.

It is an arithmetic number, because the mean of its divisors is an integer number (41707020).

Almost surely, 2^125121057 is an apocalyptic number.

It is an amenable number.

125121057 is a deficient number, since it is larger than the sum of its proper divisors (41707023).

125121057 is an equidigital number, since it uses as much as digits as its factorization.

125121057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41707022.

The product of its (nonzero) digits is 700, while the sum is 24.

The square root of 125121057 is about 11185.7524109914. The cubic root of 125121057 is about 500.1613572554.

Adding to 125121057 its reverse (750121521), we get a palindrome (875242578).

The spelling of 125121057 in words is "one hundred twenty-five million, one hundred twenty-one thousand, fifty-seven".