1317513791 has 16 divisors (see below), whose sum is σ = 1465216128. Its totient is φ = 1174692000.

The previous prime is 1317513763. The next prime is 1317513811. The reversal of 1317513791 is 1973157131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1317513791 - 2⁶ = 1317513727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317513391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113336 + ... + 124418.

It is an arithmetic number, because the mean of its divisors is an integer number (91576008).

Almost surely, 2^1317513791 is an apocalyptic number.

1317513791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1317513791 is a deficient number, since it is larger than the sum of its proper divisors (147702337).

1317513791 is a wasteful number, since it uses less digits than its factorization.

1317513791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11302.

The product of its digits is 19845, while the sum is 38.

The square root of 1317513791 is about 36297.5727976403. The cubic root of 1317513791 is about 1096.2721718140.

The spelling of 1317513791 in words is "one billion, three hundred seventeen million, five hundred thirteen thousand, seven hundred ninety-one".