198072811 has 4 divisors (see below), whose sum is σ = 199995952. Its totient is φ = 196149672.

The previous prime is 198072781. The next prime is 198072821. The reversal of 198072811 is 118270891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118270891 = 3527 ⋅33533.

It is a cyclic number.

It is not a de Polignac number, because 198072811 - 2⁵ = 198072779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198072821) 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, 961416 + ... + 961621.

It is an arithmetic number, because the mean of its divisors is an integer number (49998988).

Almost surely, 2^198072811 is an apocalyptic number.

198072811 is a deficient number, since it is larger than the sum of its proper divisors (1923141).

198072811 is a wasteful number, since it uses less digits than its factorization.

198072811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923140.

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 198072811 is about 14073.8342678888. The cubic root of 198072811 is about 582.9191035452.

The spelling of 198072811 in words is "one hundred ninety-eight million, seventy-two thousand, eight hundred eleven".