1317089561 has 2 divisors, whose sum is σ = 1317089562. Its totient is φ = 1317089560.

The previous prime is 1317089537. The next prime is 1317089573. The reversal of 1317089561 is 1659807131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1292833936 + 24255625 = 35956^2 + 4925^2 .

It is an emirp because it is prime and its reverse (1659807131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1317089561 - 2²² = 1312895257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1317089581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658544780 + 658544781.

It is an arithmetic number, because the mean of its divisors is an integer number (658544781).

Almost surely, 2^1317089561 is an apocalyptic number.

It is an amenable number.

1317089561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317089561 is an equidigital number, since it uses as much as digits as its factorization.

1317089561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 1317089561 is about 36291.7285479763. The cubic root of 1317089561 is about 1096.1544952547.

The spelling of 1317089561 in words is "one billion, three hundred seventeen million, eighty-nine thousand, five hundred sixty-one".