1315611809 has 2 divisors, whose sum is σ = 1315611810. Its totient is φ = 1315611808.

The previous prime is 1315611769. The next prime is 1315611833. The reversal of 1315611809 is 9081165131.

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., 1150566400 + 165045409 = 33920^2 + 12847^2 .

It is an emirp because it is prime and its reverse (9081165131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1315611809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1315611859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657805904 + 657805905.

It is an arithmetic number, because the mean of its divisors is an integer number (657805905).

Almost surely, 2^1315611809 is an apocalyptic number.

It is an amenable number.

1315611809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315611809 is an equidigital number, since it uses as much as digits as its factorization.

1315611809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 1315611809 is about 36271.3634841592. The cubic root of 1315611809 is about 1095.7443862953.

The spelling of 1315611809 in words is "one billion, three hundred fifteen million, six hundred eleven thousand, eight hundred nine".