198913049 has 2 divisors, whose sum is σ = 198913050. Its totient is φ = 198913048.

The previous prime is 198913021. The next prime is 198913051. The reversal of 198913049 is 940319891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173106649 + 25806400 = 13157^2 + 5080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198913049 is a prime.

Together with 198913051, 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 (198913079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99456524 + 99456525.

It is an arithmetic number, because the mean of its divisors is an integer number (99456525).

Almost surely, 2^198913049 is an apocalyptic number.

It is an amenable number.

198913049 is a deficient number, since it is larger than the sum of its proper divisors (1).

198913049 is an equidigital number, since it uses as much as digits as its factorization.

198913049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 198913049 is about 14103.6537464588. The cubic root of 198913049 is about 583.7422012601.

The spelling of 198913049 in words is "one hundred ninety-eight million, nine hundred thirteen thousand, forty-nine".