251800113 has 16 divisors (see below), whose sum is σ = 351184896. Its totient is φ = 160176720.

The previous prime is 251800111. The next prime is 251800121. The reversal of 251800113 is 311008152.

It is not a de Polignac number, because 251800113 - 2¹ = 251800111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251800113.

It is not an unprimeable number, because it can be changed into a prime (251800111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25506 + ... + 33972.

It is an arithmetic number, because the mean of its divisors is an integer number (21949056).

Almost surely, 2^251800113 is an apocalyptic number.

251800113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

251800113 is a deficient number, since it is larger than the sum of its proper divisors (99384783).

251800113 is a wasteful number, since it uses less digits than its factorization.

251800113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8924.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 251800113 is about 15868.2107687036. The cubic root of 251800113 is about 631.4689105408.

Adding to 251800113 its reverse (311008152), we get a palindrome (562808265).

The spelling of 251800113 in words is "two hundred fifty-one million, eight hundred thousand, one hundred thirteen".