198327691 has 2 divisors, whose sum is σ = 198327692. Its totient is φ = 198327690.

The previous prime is 198327631. The next prime is 198327707. The reversal of 198327691 is 196723891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198327691 - 2¹⁵ = 198294923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198327601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99163845 + 99163846.

It is an arithmetic number, because the mean of its divisors is an integer number (99163846).

Almost surely, 2^198327691 is an apocalyptic number.

198327691 is a deficient number, since it is larger than the sum of its proper divisors (1).

198327691 is an equidigital number, since it uses as much as digits as its factorization.

198327691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 46.

The square root of 198327691 is about 14082.8864583934. The cubic root of 198327691 is about 583.1690297170.

The spelling of 198327691 in words is "one hundred ninety-eight million, three hundred twenty-seven thousand, six hundred ninety-one".