161940293 has 2 divisors, whose sum is σ = 161940294. Its totient is φ = 161940292.

The previous prime is 161940277. The next prime is 161940313. The reversal of 161940293 is 392049161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127283524 + 34656769 = 11282^2 + 5887^2 .

It is a cyclic number.

It is not a de Polignac number, because 161940293 - 2⁴ = 161940277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161940223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80970146 + 80970147.

It is an arithmetic number, because the mean of its divisors is an integer number (80970147).

Almost surely, 2^161940293 is an apocalyptic number.

It is an amenable number.

161940293 is a deficient number, since it is larger than the sum of its proper divisors (1).

161940293 is an equidigital number, since it uses as much as digits as its factorization.

161940293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 161940293 is about 12725.5763327246. The cubic root of 161940293 is about 545.0691975095.

The spelling of 161940293 in words is "one hundred sixty-one million, nine hundred forty thousand, two hundred ninety-three".