251263613213 has 2 divisors, whose sum is σ = 251263613214. Its totient is φ = 251263613212.

The previous prime is 251263613207. The next prime is 251263613239. The reversal of 251263613213 is 312316362152.

It is a happy number.

251263613213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186117176569 + 65146436644 = 431413^2 + 255238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251263613213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251263613203) 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 as a sum of consecutive naturals, namely, 125631806606 + 125631806607.

It is an arithmetic number, because the mean of its divisors is an integer number (125631806607).

Almost surely, 2^251263613213 is an apocalyptic number.

It is an amenable number.

251263613213 is a deficient number, since it is larger than the sum of its proper divisors (1).

251263613213 is an equidigital number, since it uses as much as digits as its factorization.

251263613213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 35.

Adding to 251263613213 its reverse (312316362152), we get a palindrome (563579975365).

The spelling of 251263613213 in words is "two hundred fifty-one billion, two hundred sixty-three million, six hundred thirteen thousand, two hundred thirteen".