161090497 has 2 divisors, whose sum is σ = 161090498. Its totient is φ = 161090496.

The previous prime is 161090471. The next prime is 161090509. The reversal of 161090497 is 794090161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157854096 + 3236401 = 12564^2 + 1799^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161090497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161090407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80545248 + 80545249.

It is an arithmetic number, because the mean of its divisors is an integer number (80545249).

Almost surely, 2^161090497 is an apocalyptic number.

It is an amenable number.

161090497 is a deficient number, since it is larger than the sum of its proper divisors (1).

161090497 is an equidigital number, since it uses as much as digits as its factorization.

161090497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 161090497 is about 12692.1431208445. The cubic root of 161090497 is about 544.1140919600.

The spelling of 161090497 in words is "one hundred sixty-one million, ninety thousand, four hundred ninety-seven".