109198181 has 4 divisors (see below), whose sum is σ = 113945952. Its totient is φ = 104450412.

The previous prime is 109198169. The next prime is 109198189. The reversal of 109198181 is 181891901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 181891901 = 719 ⋅252979.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109198181 is a prime.

It is a super-2 number, since 2×109198181² = 23848485467417522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109198189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2373851 + ... + 2373896.

It is an arithmetic number, because the mean of its divisors is an integer number (28486488).

Almost surely, 2^109198181 is an apocalyptic number.

It is an amenable number.

109198181 is a deficient number, since it is larger than the sum of its proper divisors (4747771).

109198181 is an equidigital number, since it uses as much as digits as its factorization.

109198181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4747770.

The product of its (nonzero) digits is 5184, while the sum is 38.

The square root of 109198181 is about 10449.7933472390. The cubic root of 109198181 is about 477.9749480635.

The spelling of 109198181 in words is "one hundred nine million, one hundred ninety-eight thousand, one hundred eighty-one".