31122212117 has 2 divisors, whose sum is σ = 31122212118. Its totient is φ = 31122212116.

The previous prime is 31122212089. The next prime is 31122212161. The reversal of 31122212117 is 71121222113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28475212516 + 2646999601 = 168746^2 + 51449^2 .

It is a cyclic number.

It is not a de Polignac number, because 31122212117 - 2²⁶ = 31055103253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31122212092 and 31122212101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31122212197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561106058 + 15561106059.

It is an arithmetic number, because the mean of its divisors is an integer number (15561106059).

Almost surely, 2^31122212117 is an apocalyptic number.

It is an amenable number.

31122212117 is a deficient number, since it is larger than the sum of its proper divisors (1).

31122212117 is an equidigital number, since it uses as much as digits as its factorization.

31122212117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 23.

The spelling of 31122212117 in words is "thirty-one billion, one hundred twenty-two million, two hundred twelve thousand, one hundred seventeen".