31222211193809 has 2 divisors, whose sum is σ = 31222211193810. Its totient is φ = 31222211193808.

The previous prime is 31222211193791. The next prime is 31222211193839. The reversal of 31222211193809 is 90839111222213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24978284717584 + 6243926476225 = 4997828^2 + 2498785^2 .

It is an emirp because it is prime and its reverse (90839111222213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31222211193809 - 2²⁰ = 31222210145233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31222211193809.

It is not a weakly prime, because it can be changed into another prime (31222211193839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611105596904 + 15611105596905.

It is an arithmetic number, because the mean of its divisors is an integer number (15611105596905).

Almost surely, 2^{31222211193809} is an apocalyptic number.

It is an amenable number.

31222211193809 is a deficient number, since it is larger than the sum of its proper divisors (1).

31222211193809 is an equidigital number, since it uses as much as digits as its factorization.

31222211193809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 31222211193809 in words is "thirty-one trillion, two hundred twenty-two billion, two hundred eleven million, one hundred ninety-three thousand, eight hundred nine".