198913279 has 2 divisors, whose sum is σ = 198913280. Its totient is φ = 198913278.

The previous prime is 198913271. The next prime is 198913331. The reversal of 198913279 is 972319891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198913279 - 2³ = 198913271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198913271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99456639 + 99456640.

It is an arithmetic number, because the mean of its divisors is an integer number (99456640).

Almost surely, 2^198913279 is an apocalyptic number.

198913279 is a deficient number, since it is larger than the sum of its proper divisors (1).

198913279 is an equidigital number, since it uses as much as digits as its factorization.

198913279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 49.

The square root of 198913279 is about 14103.6619003718. The cubic root of 198913279 is about 583.7424262506.

The spelling of 198913279 in words is "one hundred ninety-eight million, nine hundred thirteen thousand, two hundred seventy-nine".