1315555873 has 2 divisors, whose sum is σ = 1315555874. Its totient is φ = 1315555872.

The previous prime is 1315555853. The next prime is 1315555883. The reversal of 1315555873 is 3785555131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1313845009 + 1710864 = 36247^2 + 1308^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315555873 - 2⁹ = 1315555361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1315555853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657777936 + 657777937.

It is an arithmetic number, because the mean of its divisors is an integer number (657777937).

Almost surely, 2^1315555873 is an apocalyptic number.

It is an amenable number.

1315555873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315555873 is an equidigital number, since it uses as much as digits as its factorization.

1315555873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 315000, while the sum is 43.

The square root of 1315555873 is about 36270.5923993530. The cubic root of 1315555873 is about 1095.7288567836.

The spelling of 1315555873 in words is "one billion, three hundred fifteen million, five hundred fifty-five thousand, eight hundred seventy-three".