1313315787 has 42 divisors (see below), whose sum is σ = 2076972924. Its totient is φ = 738163440.

The previous prime is 1313315749. The next prime is 1313315797. The reversal of 1313315787 is 7875133131.

It is not a de Polignac number, because 1313315787 - 2⁷ = 1313315659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1313315797) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 21529737 + ... + 21529797.

Almost surely, 2^1313315787 is an apocalyptic number.

1313315787 is a deficient number, since it is larger than the sum of its proper divisors (763657137).

1313315787 is an frugal number, since it uses more digits than its factorization.

1313315787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 71 counting only the distinct ones).

The product of its digits is 52920, while the sum is 39.

The square root of 1313315787 is about 36239.6990467636. The cubic root of 1313315787 is about 1095.1065795636.

It can be divided in two parts, 13133 and 15787, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 1313315787 in words is "one billion, three hundred thirteen million, three hundred fifteen thousand, seven hundred eighty-seven".