161554194 has 24 divisors (see below), whose sum is σ = 351050700. Its totient is φ = 53695008.

The previous prime is 161554187. The next prime is 161554243. The reversal of 161554194 is 491455161.

161554194 is a `hidden beast` number, since 16 + 1 + 554 + 1 + 94 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 156875625 + 4678569 = 12525^2 + 2163^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6577 + ... + 19140.

Almost surely, 2^161554194 is an apocalyptic number.

161554194 is an abundant number, since it is smaller than the sum of its proper divisors (189496506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161554194 is a wasteful number, since it uses less digits than its factorization.

161554194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26074 (or 26071 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 161554194 is about 12710.3970827036. The cubic root of 161554194 is about 544.6356670549.

The spelling of 161554194 in words is "one hundred sixty-one million, five hundred fifty-four thousand, one hundred ninety-four".