1251543552 has 160 divisors (see below), whose sum is σ = 3900559872. Its totient is φ = 349138944.

The previous prime is 1251543533. The next prime is 1251543593. The reversal of 1251543552 is 2553451521.

It is a super-2 number, since 2×1251543552² = 3132722525105553408, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460983 + ... + 463689.

Almost surely, 2^1251543552 is an apocalyptic number.

1251543552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251543552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1950279936).

1251543552 is an abundant number, since it is smaller than the sum of its proper divisors (2649016320).

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

1251543552 is an equidigital number, since it uses as much as digits as its factorization.

1251543552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778 (or 2762 counting only the distinct ones).

The product of its digits is 30000, while the sum is 33.

The square root of 1251543552 is about 35377.1614463343. The cubic root of 1251543552 is about 1077.6605602291.

The spelling of 1251543552 in words is "one billion, two hundred fifty-one million, five hundred forty-three thousand, five hundred fifty-two".