1313311231 has 4 divisors (see below), whose sum is σ = 1313757432. Its totient is φ = 1312865032.

The previous prime is 1313311229. The next prime is 1313311291. The reversal of 1313311231 is 1321133131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1321133131 = 13633 ⋅96907.

It is a cyclic number.

It is not a de Polignac number, because 1313311231 - 2¹ = 1313311229 is a prime.

It is a super-2 number, since 2×1313311231² = 3449572778941470722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313311199 and 1313311208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313311291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218656 + ... + 224581.

It is an arithmetic number, because the mean of its divisors is an integer number (328439358).

Almost surely, 2^1313311231 is an apocalyptic number.

1313311231 is a deficient number, since it is larger than the sum of its proper divisors (446201).

1313311231 is an equidigital number, since it uses as much as digits as its factorization.

1313311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446200.

The product of its digits is 162, while the sum is 19.

The square root of 1313311231 is about 36239.6361874674. The cubic root of 1313311231 is about 1095.1053132240.

Adding to 1313311231 its reverse (1321133131), we get a palindrome (2634444362).

The spelling of 1313311231 in words is "one billion, three hundred thirteen million, three hundred eleven thousand, two hundred thirty-one".