251278341313 has 2 divisors, whose sum is σ = 251278341314. Its totient is φ = 251278341312.

The previous prime is 251278341229. The next prime is 251278341319. The reversal of 251278341313 is 313143872152.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229855042624 + 21423298689 = 479432^2 + 146367^2 .

It is a cyclic number.

It is not a de Polignac number, because 251278341313 - 2¹³ = 251278333121 is a prime.

It is not a weakly prime, because it can be changed into another prime (251278341319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125639170656 + 125639170657.

It is an arithmetic number, because the mean of its divisors is an integer number (125639170657).

Almost surely, 2^251278341313 is an apocalyptic number.

It is an amenable number.

251278341313 is a deficient number, since it is larger than the sum of its proper divisors (1).

251278341313 is an equidigital number, since it uses as much as digits as its factorization.

251278341313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The spelling of 251278341313 in words is "two hundred fifty-one billion, two hundred seventy-eight million, three hundred forty-one thousand, three hundred thirteen".