1251132553 has 8 divisors (see below), whose sum is σ = 1365206976. Its totient is φ = 1137114000.

The previous prime is 1251132521. The next prime is 1251132557. The reversal of 1251132553 is 3552311521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1251132553 - 2⁵ = 1251132521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251132557) 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, 42975 + ... + 65947.

It is an arithmetic number, because the mean of its divisors is an integer number (170650872).

Almost surely, 2^1251132553 is an apocalyptic number.

It is an amenable number.

1251132553 is a deficient number, since it is larger than the sum of its proper divisors (114074423).

1251132553 is a wasteful number, since it uses less digits than its factorization.

1251132553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27935.

The product of its digits is 4500, while the sum is 28.

The square root of 1251132553 is about 35371.3521511406. The cubic root of 1251132553 is about 1077.5425816725.

The spelling of 1251132553 in words is "one billion, two hundred fifty-one million, one hundred thirty-two thousand, five hundred fifty-three".