251255334217 has 2 divisors, whose sum is σ = 251255334218. Its totient is φ = 251255334216.

The previous prime is 251255334193. The next prime is 251255334263. The reversal of 251255334217 is 712433552152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251177382976 + 77951241 = 501176^2 + 8829^2 .

It is a cyclic number.

It is not a de Polignac number, because 251255334217 - 2⁷ = 251255334089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251255334217.

It is not a weakly prime, because it can be changed into another prime (251255334817) 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 as a sum of consecutive naturals, namely, 125627667108 + 125627667109.

It is an arithmetic number, because the mean of its divisors is an integer number (125627667109).

Almost surely, 2^251255334217 is an apocalyptic number.

It is an amenable number.

251255334217 is a deficient number, since it is larger than the sum of its proper divisors (1).

251255334217 is an equidigital number, since it uses as much as digits as its factorization.

251255334217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252000, while the sum is 40.

Adding to 251255334217 its reverse (712433552152), we get a palindrome (963688886369).

The spelling of 251255334217 in words is "two hundred fifty-one billion, two hundred fifty-five million, three hundred thirty-four thousand, two hundred seventeen".