198404651 has 2 divisors, whose sum is σ = 198404652. Its totient is φ = 198404650.

The previous prime is 198404561. The next prime is 198404653. The reversal of 198404651 is 156404891.

Together with previous prime (198404561) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (156404891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198404651 is a prime.

Together with 198404653, 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 (198404653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99202325 + 99202326.

It is an arithmetic number, because the mean of its divisors is an integer number (99202326).

Almost surely, 2^198404651 is an apocalyptic number.

198404651 is a deficient number, since it is larger than the sum of its proper divisors (1).

198404651 is an equidigital number, since it uses as much as digits as its factorization.

198404651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 198404651 is about 14085.6185877653. The cubic root of 198404651 is about 583.2444518367.

The spelling of 198404651 in words is "one hundred ninety-eight million, four hundred four thousand, six hundred fifty-one".