31320322122161 has 2 divisors, whose sum is σ = 31320322122162. Its totient is φ = 31320322122160.

The previous prime is 31320322122079. The next prime is 31320322122263. The reversal of 31320322122161 is 16122122302313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22065980133136 + 9254341989025 = 4697444^2 + 3042095^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320322122161 - 2³⁸ = 31045444215217 is a prime.

It is not a weakly prime, because it can be changed into another prime (31320322125161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660161061080 + 15660161061081.

It is an arithmetic number, because the mean of its divisors is an integer number (15660161061081).

Almost surely, 2^{31320322122161} is an apocalyptic number.

It is an amenable number.

31320322122161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320322122161 is an equidigital number, since it uses as much as digits as its factorization.

31320322122161 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.

Adding to 31320322122161 its reverse (16122122302313), we get a palindrome (47442444424474).

The spelling of 31320322122161 in words is "thirty-one trillion, three hundred twenty billion, three hundred twenty-two million, one hundred twenty-two thousand, one hundred sixty-one".