1279975125 has 64 divisors (see below), whose sum is σ = 2502339840. Its totient is φ = 572832000.

The previous prime is 1279975091. The next prime is 1279975183. The reversal of 1279975125 is 5215799721.

It is a happy number.

It is not a de Polignac number, because 1279975125 - 2⁶ = 1279975061 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 (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41691 + ... + 65559.

It is an arithmetic number, because the mean of its divisors is an integer number (39099060).

Almost surely, 2^1279975125 is an apocalyptic number.

1279975125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1279975125 is a deficient number, since it is larger than the sum of its proper divisors (1222364715).

1279975125 is a wasteful number, since it uses less digits than its factorization.

1279975125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23911 (or 23901 counting only the distinct ones).

The product of its digits is 396900, while the sum is 48.

The square root of 1279975125 is about 35776.7399996143. The cubic root of 1279975125 is about 1085.7600131405.

The spelling of 1279975125 in words is "one billion, two hundred seventy-nine million, nine hundred seventy-five thousand, one hundred twenty-five".