161822105231 has 2 divisors, whose sum is σ = 161822105232. Its totient is φ = 161822105230.

The previous prime is 161822105227. The next prime is 161822105279. The reversal of 161822105231 is 132501228161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161822105231 - 2² = 161822105227 is a prime.

It is a super-2 number, since 2×161822105231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161822105131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80911052615 + 80911052616.

It is an arithmetic number, because the mean of its divisors is an integer number (80911052616).

Almost surely, 2^161822105231 is an apocalyptic number.

161822105231 is a deficient number, since it is larger than the sum of its proper divisors (1).

161822105231 is an equidigital number, since it uses as much as digits as its factorization.

161822105231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 161822105231 in words is "one hundred sixty-one billion, eight hundred twenty-two million, one hundred five thousand, two hundred thirty-one".