161940199 has 2 divisors, whose sum is σ = 161940200. Its totient is φ = 161940198.

The previous prime is 161940197. The next prime is 161940209. The reversal of 161940199 is 991049161.

161940199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161940199 - 2¹ = 161940197 is a prime.

Together with 161940197, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161940197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80970099 + 80970100.

It is an arithmetic number, because the mean of its divisors is an integer number (80970100).

Almost surely, 2^161940199 is an apocalyptic number.

161940199 is a deficient number, since it is larger than the sum of its proper divisors (1).

161940199 is an equidigital number, since it uses as much as digits as its factorization.

161940199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 161940199 is about 12725.5726393746. The cubic root of 161940199 is about 545.0690920457.

The spelling of 161940199 in words is "one hundred sixty-one million, nine hundred forty thousand, one hundred ninety-nine".