1251791912 has 64 divisors (see below), whose sum is σ = 2739744000. Its totient is φ = 525127680.

The previous prime is 1251791911. The next prime is 1251791941. The reversal of 1251791912 is 2191971521.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1251791911) 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 15 ways as a sum of consecutive naturals, for example, 591368 + ... + 593480.

It is an arithmetic number, because the mean of its divisors is an integer number (42808500).

Almost surely, 2^1251791912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251791912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1369872000).

1251791912 is an abundant number, since it is smaller than the sum of its proper divisors (1487952088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251791912 is a wasteful number, since it uses less digits than its factorization.

1251791912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346 (or 2342 counting only the distinct ones).

The product of its digits is 11340, while the sum is 38.

The square root of 1251791912 is about 35380.6714464268. The cubic root of 1251791912 is about 1077.7318402294.

The spelling of 1251791912 in words is "one billion, two hundred fifty-one million, seven hundred ninety-one thousand, nine hundred twelve".