1317251081 has 2 divisors, whose sum is σ = 1317251082. Its totient is φ = 1317251080.

The previous prime is 1317251071. The next prime is 1317251083. The reversal of 1317251081 is 1801527131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1007491081 + 309760000 = 31741^2 + 17600^2 .

It is a cyclic number.

It is not a de Polignac number, because 1317251081 - 2¹⁰ = 1317250057 is a prime.

It is a super-2 number, since 2×1317251081² = 3470300820791337122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1317251083, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1317251083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658625540 + 658625541.

It is an arithmetic number, because the mean of its divisors is an integer number (658625541).

Almost surely, 2^1317251081 is an apocalyptic number.

It is an amenable number.

1317251081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317251081 is an equidigital number, since it uses as much as digits as its factorization.

1317251081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 1317251081 is about 36293.9537802097. The cubic root of 1317251081 is about 1096.1993020374.

The spelling of 1317251081 in words is "one billion, three hundred seventeen million, two hundred fifty-one thousand, eighty-one".