1313111231 has 4 divisors (see below), whose sum is σ = 1315051512. Its totient is φ = 1311170952.

The previous prime is 1313111203. The next prime is 1313111273. The reversal of 1313111231 is 1321113131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1313111231 - 2¹⁰ = 1313110207 is a prime.

It is a super-2 number, since 2×1313111231² = 3448522209956670722, 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 (1313111281) 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, 969125 + ... + 970478.

It is an arithmetic number, because the mean of its divisors is an integer number (328762878).

Almost surely, 2^1313111231 is an apocalyptic number.

1313111231 is a deficient number, since it is larger than the sum of its proper divisors (1940281).

1313111231 is an equidigital number, since it uses as much as digits as its factorization.

1313111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940280.

The product of its digits is 54, while the sum is 17.

The square root of 1313111231 is about 36236.8766728039. The cubic root of 1313111231 is about 1095.0497203642.

Adding to 1313111231 its reverse (1321113131), we get a palindrome (2634224362).

The spelling of 1313111231 in words is "one billion, three hundred thirteen million, one hundred eleven thousand, two hundred thirty-one".