1299318257 has 2 divisors, whose sum is σ = 1299318258. Its totient is φ = 1299318256.

The previous prime is 1299318217. The next prime is 1299318269. The reversal of 1299318257 is 7528139921.

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., 1071187441 + 228130816 = 32729^2 + 15104^2 .

It is a cyclic number.

It is not a de Polignac number, because 1299318257 - 2⁶ = 1299318193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1299318217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649659128 + 649659129.

It is an arithmetic number, because the mean of its divisors is an integer number (649659129).

Almost surely, 2^1299318257 is an apocalyptic number.

It is an amenable number.

1299318257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299318257 is an equidigital number, since it uses as much as digits as its factorization.

1299318257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 1299318257 is about 36046.0574404469. The cubic root of 1299318257 is about 1091.2020677892.

The spelling of 1299318257 in words is "one billion, two hundred ninety-nine million, three hundred eighteen thousand, two hundred fifty-seven".