161811194 has 8 divisors (see below), whose sum is σ = 242798580. Its totient is φ = 80878336.

The previous prime is 161811179. The next prime is 161811281. The reversal of 161811194 is 491118161.

161811194 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 160402225 + 1408969 = 12665^2 + 1187^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 161811194.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5159 + ... + 18714.

Almost surely, 2^161811194 is an apocalyptic number.

161811194 is a deficient number, since it is larger than the sum of its proper divisors (80987386).

161811194 is a wasteful number, since it uses less digits than its factorization.

161811194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27264.

The product of its digits is 1728, while the sum is 32.

The square root of 161811194 is about 12720.5028988637. The cubic root of 161811194 is about 544.9243157254.

The spelling of 161811194 in words is "one hundred sixty-one million, eight hundred eleven thousand, one hundred ninety-four".