31323231031 has 2 divisors, whose sum is σ = 31323231032. Its totient is φ = 31323231030.

The previous prime is 31323230993. The next prime is 31323231041. The reversal of 31323231031 is 13013232313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31323231031 - 2²⁵ = 31289676599 is a prime.

It is a super-2 number, since 2×31323231031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31323230993 and 31323231011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31323231041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661615515 + 15661615516.

It is an arithmetic number, because the mean of its divisors is an integer number (15661615516).

Almost surely, 2^31323231031 is an apocalyptic number.

31323231031 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323231031 is an equidigital number, since it uses as much as digits as its factorization.

31323231031 is an odious number, because the sum of its binary digits is odd.

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

Adding to 31323231031 its reverse (13013232313), we get a palindrome (44336463344).

The spelling of 31323231031 in words is "thirty-one billion, three hundred twenty-three million, two hundred thirty-one thousand, thirty-one".