198491471 has 2 divisors, whose sum is σ = 198491472. Its totient is φ = 198491470.

The previous prime is 198491467. The next prime is 198491477. The reversal of 198491471 is 174194891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198491471 - 2² = 198491467 is a prime.

It is a super-3 number, since 3×198491471³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198491477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99245735 + 99245736.

It is an arithmetic number, because the mean of its divisors is an integer number (99245736).

Almost surely, 2^198491471 is an apocalyptic number.

198491471 is a deficient number, since it is larger than the sum of its proper divisors (1).

198491471 is an equidigital number, since it uses as much as digits as its factorization.

198491471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 44.

The square root of 198491471 is about 14088.7001174700. The cubic root of 198491471 is about 583.3295135169.

The spelling of 198491471 in words is "one hundred ninety-eight million, four hundred ninety-one thousand, four hundred seventy-one".