125122815 has 12 divisors (see below), whose sum is σ = 216879624. Its totient is φ = 66732144.

The previous prime is 125122801. The next prime is 125122831. The reversal of 125122815 is 518221521.

It is a happy number.

It is not a de Polignac number, because 125122815 - 2¹⁷ = 124991743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1390209 + ... + 1390298.

It is an arithmetic number, because the mean of its divisors is an integer number (18073302).

Almost surely, 2^125122815 is an apocalyptic number.

125122815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

125122815 is a deficient number, since it is larger than the sum of its proper divisors (91756809).

125122815 is a wasteful number, since it uses less digits than its factorization.

125122815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780518 (or 2780515 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 125122815 is about 11185.8309928230. The cubic root of 125122815 is about 500.1636997323.

The spelling of 125122815 in words is "one hundred twenty-five million, one hundred twenty-two thousand, eight hundred fifteen".