1312515251 has 2 divisors, whose sum is σ = 1312515252. Its totient is φ = 1312515250.

The previous prime is 1312515203. The next prime is 1312515257. The reversal of 1312515251 is 1525152131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1312515251 - 2¹⁴ = 1312498867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1312515251.

It is not a weakly prime, because it can be changed into another prime (1312515257) 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, 656257625 + 656257626.

It is an arithmetic number, because the mean of its divisors is an integer number (656257626).

Almost surely, 2^1312515251 is an apocalyptic number.

1312515251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312515251 is an equidigital number, since it uses as much as digits as its factorization.

1312515251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1500, while the sum is 26.

The square root of 1312515251 is about 36228.6523486591. The cubic root of 1312515251 is about 1094.8840257204.

Adding to 1312515251 its reverse (1525152131), we get a palindrome (2837667382).

The spelling of 1312515251 in words is "one billion, three hundred twelve million, five hundred fifteen thousand, two hundred fifty-one".