31312220033231 has 2 divisors, whose sum is σ = 31312220033232. Its totient is φ = 31312220033230.

The previous prime is 31312220033201. The next prime is 31312220033249. The reversal of 31312220033231 is 13233002221313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31312220033231 - 2¹⁸ = 31312219771087 is a prime.

It is a super-2 number, since 2×31312220033231² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31312220033231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31312220033201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656110016615 + 15656110016616.

It is an arithmetic number, because the mean of its divisors is an integer number (15656110016616).

Almost surely, 2^{31312220033231} is an apocalyptic number.

31312220033231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312220033231 is an equidigital number, since it uses as much as digits as its factorization.

31312220033231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 31312220033231 its reverse (13233002221313), we get a palindrome (44545222254544).

The spelling of 31312220033231 in words is "thirty-one trillion, three hundred twelve billion, two hundred twenty million, thirty-three thousand, two hundred thirty-one".