1313321231 has 16 divisors (see below), whose sum is σ = 1405052160. Its totient is φ = 1224840960.

The previous prime is 1313321209. The next prime is 1313321257. The reversal of 1313321231 is 1321233131.

It is a cyclic number.

It is not a de Polignac number, because 1313321231 - 2¹⁰ = 1313320207 is a prime.

It is a super-2 number, since 2×1313321231² = 3449625311590710722, 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 (1313321831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657971 + ... + 659963.

It is an arithmetic number, because the mean of its divisors is an integer number (87815760).

Almost surely, 2^1313321231 is an apocalyptic number.

1313321231 is a deficient number, since it is larger than the sum of its proper divisors (91730929).

1313321231 is a wasteful number, since it uses less digits than its factorization.

1313321231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786.

The product of its digits is 324, while the sum is 20.

The square root of 1313321231 is about 36239.7741576848. The cubic root of 1313321231 is about 1095.1080927189.

Adding to 1313321231 its reverse (1321233131), we get a palindrome (2634554362).

The spelling of 1313321231 in words is "one billion, three hundred thirteen million, three hundred twenty-one thousand, two hundred thirty-one".