31231312223 has 2 divisors, whose sum is σ = 31231312224. Its totient is φ = 31231312222.

The previous prime is 31231312219. The next prime is 31231312247. The reversal of 31231312223 is 32221313213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31231312223 - 2² = 31231312219 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31231312253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615656111 + 15615656112.

It is an arithmetic number, because the mean of its divisors is an integer number (15615656112).

Almost surely, 2^31231312223 is an apocalyptic number.

31231312223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231312223 is an equidigital number, since it uses as much as digits as its factorization.

31231312223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 23.

Adding to 31231312223 its reverse (32221313213), we get a palindrome (63452625436).

The spelling of 31231312223 in words is "thirty-one billion, two hundred thirty-one million, three hundred twelve thousand, two hundred twenty-three".