161098618 has 4 divisors (see below), whose sum is σ = 241647930. Its totient is φ = 80549308.

The previous prime is 161098607. The next prime is 161098631. The reversal of 161098618 is 816890161.

161098618 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 816890161 = 19 ⋅42994219.

It can be written as a sum of positive squares in only one way, i.e., 88115769 + 72982849 = 9387^2 + 8543^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40274653 + ... + 40274656.

Almost surely, 2^161098618 is an apocalyptic number.

161098618 is a deficient number, since it is larger than the sum of its proper divisors (80549312).

161098618 is an equidigital number, since it uses as much as digits as its factorization.

161098618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80549311.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 161098618 is about 12692.4630391426. The cubic root of 161098618 is about 544.1232352187.

The spelling of 161098618 in words is "one hundred sixty-one million, ninety-eight thousand, six hundred eighteen".