1317639531 has 48 divisors (see below), whose sum is σ = 2061911040. Its totient is φ = 743152320.

The previous prime is 1317639529. The next prime is 1317639541. The reversal of 1317639531 is 1359367131.

It is not a de Polignac number, because 1317639531 - 2¹ = 1317639529 is a prime.

It is a super-2 number, since 2×1317639531² = 3472347867307799922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 1317639531.

It is not an unprimeable number, because it can be changed into a prime (1317639511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 434940 + ... + 437958.

It is an arithmetic number, because the mean of its divisors is an integer number (42956480).

Almost surely, 2^1317639531 is an apocalyptic number.

1317639531 is a deficient number, since it is larger than the sum of its proper divisors (744271509).

1317639531 is a wasteful number, since it uses less digits than its factorization.

1317639531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3104 (or 3085 counting only the distinct ones).

The product of its digits is 51030, while the sum is 39.

The square root of 1317639531 is about 36299.3048280542. The cubic root of 1317639531 is about 1096.3070458013.

The spelling of 1317639531 in words is "one billion, three hundred seventeen million, six hundred thirty-nine thousand, five hundred thirty-one".