1251899012 has 24 divisors (see below), whose sum is σ = 2696398656. Its totient is φ = 495256608.

The previous prime is 1251898979. The next prime is 1251899027. The reversal of 1251899012 is 2109981521.

It is a happy number.

It is a super-2 number, since 2×1251899012² = 3134502272493152288, which contains 22 as substring.

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, 1719278 + ... + 1720005.

It is an arithmetic number, because the mean of its divisors is an integer number (112349944).

Almost surely, 2^1251899012 is an apocalyptic number.

It is an amenable number.

1251899012 is an abundant number, since it is smaller than the sum of its proper divisors (1444499644).

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

1251899012 is a wasteful number, since it uses less digits than its factorization.

1251899012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439307 (or 3439305 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 1251899012 is about 35382.1849523175. The cubic root of 1251899012 is about 1077.7625753133.

The spelling of 1251899012 in words is "one billion, two hundred fifty-one million, eight hundred ninety-nine thousand, twelve".