198103691 has 2 divisors, whose sum is σ = 198103692. Its totient is φ = 198103690.

The previous prime is 198103681. The next prime is 198103693. The reversal of 198103691 is 196301891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198103691 is a prime.

Together with 198103693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198103693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99051845 + 99051846.

It is an arithmetic number, because the mean of its divisors is an integer number (99051846).

Almost surely, 2^198103691 is an apocalyptic number.

198103691 is a deficient number, since it is larger than the sum of its proper divisors (1).

198103691 is an equidigital number, since it uses as much as digits as its factorization.

198103691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 198103691 is about 14074.9312964575. The cubic root of 198103691 is about 582.9493947741.

The spelling of 198103691 in words is "one hundred ninety-eight million, one hundred three thousand, six hundred ninety-one".