198695051 has 2 divisors, whose sum is σ = 198695052. Its totient is φ = 198695050.

The previous prime is 198695047. The next prime is 198695053. The reversal of 198695051 is 150596891.

It is a strong prime.

It is an emirp because it is prime and its reverse (150596891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198695051 - 2² = 198695047 is a prime.

Together with 198695053, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 198694993 and 198695011.

It is not a weakly prime, because it can be changed into another prime (198695053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99347525 + 99347526.

It is an arithmetic number, because the mean of its divisors is an integer number (99347526).

Almost surely, 2^198695051 is an apocalyptic number.

198695051 is a deficient number, since it is larger than the sum of its proper divisors (1).

198695051 is an equidigital number, since it uses as much as digits as its factorization.

198695051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 44.

The square root of 198695051 is about 14095.9232049554. The cubic root of 198695051 is about 583.5288732935.

The spelling of 198695051 in words is "one hundred ninety-eight million, six hundred ninety-five thousand, fifty-one".