1315807891 has 2 divisors, whose sum is σ = 1315807892. Its totient is φ = 1315807890.

The previous prime is 1315807849. The next prime is 1315807919. The reversal of 1315807891 is 1987085131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1315807891 - 2¹⁷ = 1315676819 is a prime.

It is a super-3 number, since 3×1315807891³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1315807291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657903945 + 657903946.

It is an arithmetic number, because the mean of its divisors is an integer number (657903946).

Almost surely, 2^1315807891 is an apocalyptic number.

1315807891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315807891 is an equidigital number, since it uses as much as digits as its factorization.

1315807891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 43.

The square root of 1315807891 is about 36274.0663697910. The cubic root of 1315807891 is about 1095.7988210649.

The spelling of 1315807891 in words is "one billion, three hundred fifteen million, eight hundred seven thousand, eight hundred ninety-one".