1313321431 has 4 divisors (see below), whose sum is σ = 1315932912. Its totient is φ = 1310709952.

The previous prime is 1313321419. The next prime is 1313321441. The reversal of 1313321431 is 1341233131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1341233131 = 7 ⋅191604733.

It is a cyclic number.

It is not a de Polignac number, because 1313321431 - 2⁹ = 1313320919 is a prime.

It is a super-2 number, since 2×1313321431² = 3449626362247775522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313321411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1304986 + ... + 1305991.

It is an arithmetic number, because the mean of its divisors is an integer number (328983228).

Almost surely, 2^1313321431 is an apocalyptic number.

1313321431 is a deficient number, since it is larger than the sum of its proper divisors (2611481).

1313321431 is an equidigital number, since it uses as much as digits as its factorization.

1313321431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611480.

The product of its digits is 648, while the sum is 22.

The square root of 1313321431 is about 36239.7769170838. The cubic root of 1313321431 is about 1095.1081483086.

Adding to 1313321431 its reverse (1341233131), we get a palindrome (2654554562).

The spelling of 1313321431 in words is "one billion, three hundred thirteen million, three hundred twenty-one thousand, four hundred thirty-one".