31130122217 has 2 divisors, whose sum is σ = 31130122218. Its totient is φ = 31130122216.

The previous prime is 31130122211. The next prime is 31130122229. The reversal of 31130122217 is 71222103113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29338208656 + 1791913561 = 171284^2 + 42331^2 .

It is a cyclic number.

It is not a de Polignac number, because 31130122217 - 2⁸ = 31130121961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31130122192 and 31130122201.

It is not a weakly prime, because it can be changed into another prime (31130122211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565061108 + 15565061109.

It is an arithmetic number, because the mean of its divisors is an integer number (15565061109).

Almost surely, 2^31130122217 is an apocalyptic number.

It is an amenable number.

31130122217 is a deficient number, since it is larger than the sum of its proper divisors (1).

31130122217 is an equidigital number, since it uses as much as digits as its factorization.

31130122217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The spelling of 31130122217 in words is "thirty-one billion, one hundred thirty million, one hundred twenty-two thousand, two hundred seventeen".