31220403169 has 2 divisors, whose sum is σ = 31220403170. Its totient is φ = 31220403168.

The previous prime is 31220403157. The next prime is 31220403239. The reversal of 31220403169 is 96130402213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27058605025 + 4161798144 = 164495^2 + 64512^2 .

It is a cyclic number.

It is not a de Polignac number, because 31220403169 - 2⁷ = 31220403041 is a prime.

It is a super-2 number, since 2×31220403169² (a number of 22 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 31220403169.

It is not a weakly prime, because it can be changed into another prime (31220403569) 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, 15610201584 + 15610201585.

It is an arithmetic number, because the mean of its divisors is an integer number (15610201585).

Almost surely, 2^31220403169 is an apocalyptic number.

It is an amenable number.

31220403169 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220403169 is an equidigital number, since it uses as much as digits as its factorization.

31220403169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 31220403169 in words is "thirty-one billion, two hundred twenty million, four hundred three thousand, one hundred sixty-nine".