31423122209 has 2 divisors, whose sum is σ = 31423122210. Its totient is φ = 31423122208.

The previous prime is 31423122191. The next prime is 31423122223. The reversal of 31423122209 is 90222132413.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27192010000 + 4231112209 = 164900^2 + 65047^2 .

It is a cyclic number.

It is not a de Polignac number, because 31423122209 - 2²⁸ = 31154686753 is a prime.

It is not a weakly prime, because it can be changed into another prime (31423122259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711561104 + 15711561105.

It is an arithmetic number, because the mean of its divisors is an integer number (15711561105).

Almost surely, 2^31423122209 is an apocalyptic number.

It is an amenable number.

31423122209 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423122209 is an equidigital number, since it uses as much as digits as its factorization.

31423122209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 31423122209 in words is "thirty-one billion, four hundred twenty-three million, one hundred twenty-two thousand, two hundred nine".