161183986 has 8 divisors (see below), whose sum is σ = 242262000. Its totient is φ = 80429988.

The previous prime is 161183969. The next prime is 161183999. The reversal of 161183986 is 689381161.

It is a happy number.

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

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, 79756 + ... + 81751.

It is an arithmetic number, because the mean of its divisors is an integer number (30282750).

Almost surely, 2^161183986 is an apocalyptic number.

161183986 is a deficient number, since it is larger than the sum of its proper divisors (81078014).

161183986 is a wasteful number, since it uses less digits than its factorization.

161183986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162008.

The product of its digits is 62208, while the sum is 43.

The square root of 161183986 is about 12695.8255344030. The cubic root of 161183986 is about 544.2193306217.

The spelling of 161183986 in words is "one hundred sixty-one million, one hundred eighty-three thousand, nine hundred eighty-six".