1312505251 has 2 divisors, whose sum is σ = 1312505252. Its totient is φ = 1312505250.

The previous prime is 1312505239. The next prime is 1312505273. The reversal of 1312505251 is 1525052131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312505251 - 2¹³ = 1312497059 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312505651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656252625 + 656252626.

It is an arithmetic number, because the mean of its divisors is an integer number (656252626).

Almost surely, 2^1312505251 is an apocalyptic number.

1312505251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312505251 is an equidigital number, since it uses as much as digits as its factorization.

1312505251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1312505251 is about 36228.5143360862. The cubic root of 1312505251 is about 1094.8812450878.

Adding to 1312505251 its reverse (1525052131), we get a palindrome (2837557382).

The spelling of 1312505251 in words is "one billion, three hundred twelve million, five hundred five thousand, two hundred fifty-one".