161603185 has 8 divisors (see below), whose sum is σ = 194625576. Its totient is φ = 128814720.

The previous prime is 161603179. The next prime is 161603191. The reversal of 161603185 is 581306161.

It is an interprime number because it is at equal distance from previous prime (161603179) and next prime (161603191).

It can be written as a sum of positive squares in 4 ways, for example, as 34093921 + 127509264 = 5839^2 + 11292^2 .

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

It is not a de Polignac number, because 161603185 - 2⁵ = 161603153 is a prime.

It is a super-2 number, since 2×161603185² = 52231178804288450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56956 + ... + 59725.

It is an arithmetic number, because the mean of its divisors is an integer number (24328197).

Almost surely, 2^161603185 is an apocalyptic number.

It is an amenable number.

161603185 is a deficient number, since it is larger than the sum of its proper divisors (33022391).

161603185 is a wasteful number, since it uses less digits than its factorization.

161603185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116963.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 161603185 is about 12712.3241384099. The cubic root of 161603185 is about 544.6907147320.

The spelling of 161603185 in words is "one hundred sixty-one million, six hundred three thousand, one hundred eighty-five".