31312210231 has 4 divisors (see below), whose sum is σ = 31312875672. Its totient is φ = 31311544792.

The previous prime is 31312210229. The next prime is 31312210247. The reversal of 31312210231 is 13201221313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13201221313 = 7 ⋅1885888759.

It is a cyclic number.

It is not a de Polignac number, because 31312210231 - 2¹ = 31312210229 is a prime.

It is a super-2 number, since 2×31312210231² (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 = 31312210199 and 31312210208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312210211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256285 + ... + 358198.

It is an arithmetic number, because the mean of its divisors is an integer number (7828218918).

Almost surely, 2^31312210231 is an apocalyptic number.

31312210231 is a deficient number, since it is larger than the sum of its proper divisors (665441).

31312210231 is an equidigital number, since it uses as much as digits as its factorization.

31312210231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665440.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31312210231 its reverse (13201221313), we get a palindrome (44513431544).

The spelling of 31312210231 in words is "thirty-one billion, three hundred twelve million, two hundred ten thousand, two hundred thirty-one".