161191599 has 32 divisors (see below), whose sum is σ = 233625600. Its totient is φ = 98609280.

The previous prime is 161191579. The next prime is 161191607. The reversal of 161191599 is 995191161.

It is not a de Polignac number, because 161191599 - 2⁸ = 161191343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161191599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161191579) 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 in 31 ways as a sum of consecutive naturals, for example, 158617 + ... + 159629.

It is an arithmetic number, because the mean of its divisors is an integer number (7300800).

Almost surely, 2^161191599 is an apocalyptic number.

161191599 is a deficient number, since it is larger than the sum of its proper divisors (72434001).

161191599 is a wasteful number, since it uses less digits than its factorization.

161191599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135.

The product of its digits is 21870, while the sum is 42.

The square root of 161191599 is about 12696.1253538235. The cubic root of 161191599 is about 544.2278986286.

The spelling of 161191599 in words is "one hundred sixty-one million, one hundred ninety-one thousand, five hundred ninety-nine".