198692891 has 4 divisors (see below), whose sum is σ = 205544400. Its totient is φ = 191841384.

The previous prime is 198692869. The next prime is 198692903. The reversal of 198692891 is 198296891.

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

It is a cyclic number.

It is not a de Polignac number, because 198692891 - 2²² = 194498587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198692831) 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, 3425711 + ... + 3425768.

It is an arithmetic number, because the mean of its divisors is an integer number (51386100).

Almost surely, 2^198692891 is an apocalyptic number.

198692891 is a deficient number, since it is larger than the sum of its proper divisors (6851509).

198692891 is an equidigital number, since it uses as much as digits as its factorization.

198692891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851508.

The product of its digits is 559872, while the sum is 53.

The square root of 198692891 is about 14095.8465868496. The cubic root of 198692891 is about 583.5267587853.

The spelling of 198692891 in words is "one hundred ninety-eight million, six hundred ninety-two thousand, eight hundred ninety-one".