31220493811231 has 2 divisors, whose sum is σ = 31220493811232. Its totient is φ = 31220493811230.

The previous prime is 31220493811193. The next prime is 31220493811249. The reversal of 31220493811231 is 13211839402213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31220493811231 - 2²⁷ = 31220359593503 is a prime.

It is a super-2 number, since 2×31220493811231² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31220493911231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610246905615 + 15610246905616.

It is an arithmetic number, because the mean of its divisors is an integer number (15610246905616).

Almost surely, 2^{31220493811231} is an apocalyptic number.

31220493811231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220493811231 is an equidigital number, since it uses as much as digits as its factorization.

31220493811231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 31220493811231 in words is "thirty-one trillion, two hundred twenty billion, four hundred ninety-three million, eight hundred eleven thousand, two hundred thirty-one".