198049819 has 4 divisors (see below), whose sum is σ = 216054360. Its totient is φ = 180045280.

The previous prime is 198049807. The next prime is 198049823. The reversal of 198049819 is 918940891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198049819 is a prime.

It is a super-2 number, since 2×198049819² = 78447461611865522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198049519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9002254 + ... + 9002275.

It is an arithmetic number, because the mean of its divisors is an integer number (54013590).

Almost surely, 2^198049819 is an apocalyptic number.

198049819 is a deficient number, since it is larger than the sum of its proper divisors (18004541).

198049819 is a wasteful number, since it uses less digits than its factorization.

198049819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18004540.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 198049819 is about 14073.0174092126. The cubic root of 198049819 is about 582.8965478756.

The spelling of 198049819 in words is "one hundred ninety-eight million, forty-nine thousand, eight hundred nineteen".