1251534916 has 24 divisors (see below), whose sum is σ = 2270431296. Its totient is φ = 603156960.

The previous prime is 1251534913. The next prime is 1251534929. The reversal of 1251534916 is 6194351521.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (1251534913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23680 + ... + 55351.

It is an arithmetic number, because the mean of its divisors is an integer number (94601304).

Almost surely, 2^1251534916 is an apocalyptic number.

It is an amenable number.

1251534916 is a deficient number, since it is larger than the sum of its proper divisors (1018896380).

1251534916 is a wasteful number, since it uses less digits than its factorization.

1251534916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79179 (or 79177 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 1251534916 is about 35377.0393899772. The cubic root of 1251534916 is about 1077.6580815038.

The spelling of 1251534916 in words is "one billion, two hundred fifty-one million, five hundred thirty-four thousand, nine hundred sixteen".