161320199 has 4 divisors (see below), whose sum is σ = 165254880. Its totient is φ = 157385520.

The previous prime is 161320193. The next prime is 161320217. The reversal of 161320199 is 991023161.

161320199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 991023161 = 2549 ⋅388789.

It is a cyclic number.

It is not a de Polignac number, because 161320199 - 2⁸ = 161319943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161320193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1967279 + ... + 1967360.

It is an arithmetic number, because the mean of its divisors is an integer number (41313720).

Almost surely, 2^161320199 is an apocalyptic number.

161320199 is a deficient number, since it is larger than the sum of its proper divisors (3934681).

161320199 is an equidigital number, since it uses as much as digits as its factorization.

161320199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3934680.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 161320199 is about 12701.1888813607. The cubic root of 161320199 is about 544.3725900067.

It can be divided in two parts, 1613 and 20199, that added together give a palindrome (21812).

The spelling of 161320199 in words is "one hundred sixty-one million, three hundred twenty thousand, one hundred ninety-nine".