161191894 has 16 divisors (see below), whose sum is σ = 246355200. Its totient is φ = 79078824.

The previous prime is 161191873. The next prime is 161191897. The reversal of 161191894 is 498191161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161191897) 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 7 ways as a sum of consecutive naturals, for example, 84847 + ... + 86725.

It is an arithmetic number, because the mean of its divisors is an integer number (15397200).

Almost surely, 2^161191894 is an apocalyptic number.

161191894 is a deficient number, since it is larger than the sum of its proper divisors (85163306).

161191894 is a wasteful number, since it uses less digits than its factorization.

161191894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667.

The product of its digits is 15552, while the sum is 40.

The square root of 161191894 is about 12696.1369715359. The cubic root of 161191894 is about 544.2282306293.

The spelling of 161191894 in words is "one hundred sixty-one million, one hundred ninety-one thousand, eight hundred ninety-four".