251115340211 has 4 divisors (see below), whose sum is σ = 255853365552. Its totient is φ = 246377314872.

The previous prime is 251115340129. The next prime is 251115340243. The reversal of 251115340211 is 112043511152.

251115340211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251115340211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251115340261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2369012591 + ... + 2369012696.

It is an arithmetic number, because the mean of its divisors is an integer number (63963341388).

Almost surely, 2^251115340211 is an apocalyptic number.

251115340211 is a deficient number, since it is larger than the sum of its proper divisors (4738025341).

251115340211 is an equidigital number, since it uses as much as digits as its factorization.

251115340211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4738025340.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 251115340211 its reverse (112043511152), we get a palindrome (363158851363).

The spelling of 251115340211 in words is "two hundred fifty-one billion, one hundred fifteen million, three hundred forty thousand, two hundred eleven".