31220399999 has 2 divisors, whose sum is σ = 31220400000. Its totient is φ = 31220399998.

The previous prime is 31220399981. The next prime is 31220400019. The reversal of 31220399999 is 99999302213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31220399999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31220359999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610199999 + 15610200000.

It is an arithmetic number, because the mean of its divisors is an integer number (15610200000).

Almost surely, 2^31220399999 is an apocalyptic number.

31220399999 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220399999 is an equidigital number, since it uses as much as digits as its factorization.

31220399999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2125764, while the sum is 56.

The spelling of 31220399999 in words is "thirty-one billion, two hundred twenty million, three hundred ninety-nine thousand, nine hundred ninety-nine".