198494971 has 2 divisors, whose sum is σ = 198494972. Its totient is φ = 198494970.

The previous prime is 198494963. The next prime is 198494993. The reversal of 198494971 is 179494891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198494971 - 2³ = 198494963 is a prime.

It is not a weakly prime, because it can be changed into another prime (198494171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99247485 + 99247486.

It is an arithmetic number, because the mean of its divisors is an integer number (99247486).

Almost surely, 2^198494971 is an apocalyptic number.

198494971 is a deficient number, since it is larger than the sum of its proper divisors (1).

198494971 is an equidigital number, since it uses as much as digits as its factorization.

198494971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 52.

The square root of 198494971 is about 14088.8243299432. The cubic root of 198494971 is about 583.3329421131.

The spelling of 198494971 in words is "one hundred ninety-eight million, four hundred ninety-four thousand, nine hundred seventy-one".