1251909552 has 30 divisors (see below), whose sum is σ = 3234733068. Its totient is φ = 417221472.

The previous prime is 1251909521. The next prime is 1251909553. The reversal of 1251909552 is 2559091521.

It is a self number, because there is not a number n which added to its sum of digits gives 1251909552.

It is not an unprimeable number, because it can be changed into a prime (1251909553) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 242583 + ... + 247689.

Almost surely, 2^1251909552 is an apocalyptic number.

1251909552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1251909552 is an abundant number, since it is smaller than the sum of its proper divisors (1982823516).

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

1251909552 is an frugal number, since it uses more digits than its factorization.

1251909552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10225 (or 5112 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 39.

The square root of 1251909552 is about 35382.3338970170. Note that the first 3 decimals coincide. The cubic root of 1251909552 is about 1077.7655999411.

The spelling of 1251909552 in words is "one billion, two hundred fifty-one million, nine hundred nine thousand, five hundred fifty-two".