161883118 has 4 divisors (see below), whose sum is σ = 242824680. Its totient is φ = 80941558.

The previous prime is 161883109. The next prime is 161883157. The reversal of 161883118 is 811388161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 811388161 = 1657 ⋅489673.

It is a super-2 number, since 2×161883118² = 52412287786803848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40470778 + ... + 40470781.

It is an arithmetic number, because the mean of its divisors is an integer number (60706170).

Almost surely, 2^161883118 is an apocalyptic number.

161883118 is a deficient number, since it is larger than the sum of its proper divisors (80941562).

161883118 is an equidigital number, since it uses as much as digits as its factorization.

161883118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80941561.

The product of its digits is 9216, while the sum is 37.

The square root of 161883118 is about 12723.3296742637. The cubic root of 161883118 is about 545.0050421776.

It can be divided in two parts, 16188 and 3118, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 161883118 in words is "one hundred sixty-one million, eight hundred eighty-three thousand, one hundred eighteen".