1251279164 has 24 divisors (see below), whose sum is σ = 2315515776. Its totient is φ = 590688000.

The previous prime is 1251279151. The next prime is 1251279191. The reversal of 1251279164 is 4619721521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117977 + ... + 128144.

It is an arithmetic number, because the mean of its divisors is an integer number (96479824).

Almost surely, 2^1251279164 is an apocalyptic number.

It is an amenable number.

1251279164 is a deficient number, since it is larger than the sum of its proper divisors (1064236612).

1251279164 is a wasteful number, since it uses less digits than its factorization.

1251279164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246197 (or 246195 counting only the distinct ones).

The product of its digits is 30240, while the sum is 38.

The square root of 1251279164 is about 35373.4245444232. The cubic root of 1251279164 is about 1077.5846697856.

The spelling of 1251279164 in words is "one billion, two hundred fifty-one million, two hundred seventy-nine thousand, one hundred sixty-four".