1251163520 has 32 divisors (see below), whose sum is σ = 2991064320. Its totient is φ = 500465152.

The previous prime is 1251163489. The next prime is 1251163523. The reversal of 1251163520 is 253611521.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1251163520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251163523) 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 3 ways as a sum of consecutive naturals, for example, 976832 + ... + 978111.

It is an arithmetic number, because the mean of its divisors is an integer number (93470760).

Almost surely, 2^1251163520 is an apocalyptic number.

1251163520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251163520 is an abundant number, since it is smaller than the sum of its proper divisors (1739900800).

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

1251163520 is an equidigital number, since it uses as much as digits as its factorization.

1251163520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954962 (or 1954950 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1251163520 is about 35371.7898896847. The cubic root of 1251163520 is about 1077.5514717473.

The spelling of 1251163520 in words is "one billion, two hundred fifty-one million, one hundred sixty-three thousand, five hundred twenty".