31220222309 has 2 divisors, whose sum is σ = 31220222310. Its totient is φ = 31220222308.

The previous prime is 31220222291. The next prime is 31220222351. The reversal of 31220222309 is 90322202213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31073933284 + 146289025 = 176278^2 + 12095^2 .

It is a cyclic number.

It is not a de Polignac number, because 31220222309 - 2⁸ = 31220222053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31220222359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610111154 + 15610111155.

It is an arithmetic number, because the mean of its divisors is an integer number (15610111155).

Almost surely, 2^31220222309 is an apocalyptic number.

It is an amenable number.

31220222309 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220222309 is an equidigital number, since it uses as much as digits as its factorization.

31220222309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The spelling of 31220222309 in words is "thirty-one billion, two hundred twenty million, two hundred twenty-two thousand, three hundred nine".