161499199 has 2 divisors, whose sum is σ = 161499200. Its totient is φ = 161499198.

The previous prime is 161499197. The next prime is 161499209. The reversal of 161499199 is 991994161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161499199 - 2¹ = 161499197 is a prime.

Together with 161499197, 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 (161499193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80749599 + 80749600.

It is an arithmetic number, because the mean of its divisors is an integer number (80749600).

Almost surely, 2^161499199 is an apocalyptic number.

161499199 is a deficient number, since it is larger than the sum of its proper divisors (1).

161499199 is an equidigital number, since it uses as much as digits as its factorization.

161499199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 49.

The square root of 161499199 is about 12708.2335121763. The cubic root of 161499199 is about 544.5738598534.

The spelling of 161499199 in words is "one hundred sixty-one million, four hundred ninety-nine thousand, one hundred ninety-nine".