1317331431 has 56 divisors (see below), whose sum is σ = 2139831680. Its totient is φ = 805795776.

The previous prime is 1317331423. The next prime is 1317331441. The reversal of 1317331431 is 1341337131.

1317331431 is a `hidden beast` number, since 1 + 317 + 3 + 314 + 31 = 666.

1317331431 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1317331431 - 2³ = 1317331423 is a prime.

It is a super-2 number, since 2×1317331431² = 3470724198201015522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1317331395 and 1317331404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317331441) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 2169930 + ... + 2170536.

It is an arithmetic number, because the mean of its divisors is an integer number (38211280).

Almost surely, 2^1317331431 is an apocalyptic number.

1317331431 is a deficient number, since it is larger than the sum of its proper divisors (822500249).

1317331431 is an equidigital number, since it uses as much as digits as its factorization.

1317331431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867 (or 852 counting only the distinct ones).

The product of its digits is 2268, while the sum is 27.

The square root of 1317331431 is about 36295.0606970150. The cubic root of 1317331431 is about 1096.2215903276.

Adding to 1317331431 its reverse (1341337131), we get a palindrome (2658668562).

The spelling of 1317331431 in words is "one billion, three hundred seventeen million, three hundred thirty-one thousand, four hundred thirty-one".