1317251249 has 2 divisors, whose sum is σ = 1317251250. Its totient is φ = 1317251248.

The previous prime is 1317251231. The next prime is 1317251303. The reversal of 1317251249 is 9421527131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 915970225 + 401281024 = 30265^2 + 20032^2 .

It is a cyclic number.

It is not a de Polignac number, because 1317251249 - 2¹² = 1317247153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1317251149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658625624 + 658625625.

It is an arithmetic number, because the mean of its divisors is an integer number (658625625).

Almost surely, 2^1317251249 is an apocalyptic number.

It is an amenable number.

1317251249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317251249 is an equidigital number, since it uses as much as digits as its factorization.

1317251249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 1317251249 is about 36293.9560946447. The cubic root of 1317251249 is about 1096.1993486399.

The spelling of 1317251249 in words is "one billion, three hundred seventeen million, two hundred fifty-one thousand, two hundred forty-nine".