198713181 has 4 divisors (see below), whose sum is σ = 264950912. Its totient is φ = 132475452.

The previous prime is 198713161. The next prime is 198713269. The reversal of 198713181 is 181317891.

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: 181317891 = 3 ⋅60439297.

It is not a de Polignac number, because 198713181 - 2⁶ = 198713117 is a prime.

It is a super-2 number, since 2×198713181² = 78973856606277522, 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 (198713161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33118861 + ... + 33118866.

It is an arithmetic number, because the mean of its divisors is an integer number (66237728).

Almost surely, 2^198713181 is an apocalyptic number.

It is an amenable number.

198713181 is a deficient number, since it is larger than the sum of its proper divisors (66237731).

198713181 is an equidigital number, since it uses as much as digits as its factorization.

198713181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66237730.

The product of its digits is 12096, while the sum is 39.

The square root of 198713181 is about 14096.5662840282. The cubic root of 198713181 is about 583.5466208530.

The spelling of 198713181 in words is "one hundred ninety-eight million, seven hundred thirteen thousand, one hundred eighty-one".