161281199 has 2 divisors, whose sum is σ = 161281200. Its totient is φ = 161281198.

The previous prime is 161281157. The next prime is 161281213. The reversal of 161281199 is 991182161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161281199 - 2²⁰ = 160232623 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161284199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80640599 + 80640600.

It is an arithmetic number, because the mean of its divisors is an integer number (80640600).

Almost surely, 2^161281199 is an apocalyptic number.

161281199 is a deficient number, since it is larger than the sum of its proper divisors (1).

161281199 is an equidigital number, since it uses as much as digits as its factorization.

161281199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 38.

The square root of 161281199 is about 12699.6534992101. The cubic root of 161281199 is about 544.3287181662.

The spelling of 161281199 in words is "one hundred sixty-one million, two hundred eighty-one thousand, one hundred ninety-nine".