31323312031 has 16 divisors (see below), whose sum is σ = 34984667520. Its totient is φ = 27798311520.

The previous prime is 31323312001. The next prime is 31323312043. The reversal of 31323312031 is 13021332313.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31323312031 is a prime.

It is a super-2 number, since 2×31323312031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31323311993 and 31323312011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323312001) 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, 897180 + ... + 931438.

It is an arithmetic number, because the mean of its divisors is an integer number (2186541720).

Almost surely, 2^31323312031 is an apocalyptic number.

31323312031 is a deficient number, since it is larger than the sum of its proper divisors (3661355489).

31323312031 is a wasteful number, since it uses less digits than its factorization.

31323312031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36246.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31323312031 its reverse (13021332313), we get a palindrome (44344644344).

The spelling of 31323312031 in words is "thirty-one billion, three hundred twenty-three million, three hundred twelve thousand, thirty-one".