31323321331 has 4 divisors (see below), whose sum is σ = 31836818464. Its totient is φ = 30809824200.

The previous prime is 31323321329. The next prime is 31323321343. The reversal of 31323321331 is 13312332313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13312332313 = 7 ⋅1901761759.

It is a cyclic number.

It is not a de Polignac number, because 31323321331 - 2¹ = 31323321329 is a prime.

It is a super-2 number, since 2×31323321331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31323321296 and 31323321305.

It is not an unprimeable number, because it can be changed into a prime (31323321301) 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, 256748475 + ... + 256748596.

It is an arithmetic number, because the mean of its divisors is an integer number (7959204616).

Almost surely, 2^31323321331 is an apocalyptic number.

31323321331 is a deficient number, since it is larger than the sum of its proper divisors (513497133).

31323321331 is an equidigital number, since it uses as much as digits as its factorization.

31323321331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513497132.

The product of its digits is 2916, while the sum is 25.

Adding to 31323321331 its reverse (13312332313), we get a palindrome (44635653644).

The spelling of 31323321331 in words is "thirty-one billion, three hundred twenty-three million, three hundred twenty-one thousand, three hundred thirty-one".