251252204513 has 4 divisors (see below), whose sum is σ = 259357114368. Its totient is φ = 243147294660.

The previous prime is 251252204461. The next prime is 251252204537. The reversal of 251252204513 is 315402252152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251252204513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251252204513.

It is not an unprimeable number, because it can be changed into a prime (251252204543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4052454881 + ... + 4052454942.

It is an arithmetic number, because the mean of its divisors is an integer number (64839278592).

Almost surely, 2^251252204513 is an apocalyptic number.

It is an amenable number.

251252204513 is a deficient number, since it is larger than the sum of its proper divisors (8104909855).

251252204513 is an equidigital number, since it uses as much as digits as its factorization.

251252204513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8104909854.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 251252204513 its reverse (315402252152), we get a palindrome (566654456665).

The spelling of 251252204513 in words is "two hundred fifty-one billion, two hundred fifty-two million, two hundred four thousand, five hundred thirteen".