198591847 has 2 divisors, whose sum is σ = 198591848. Its totient is φ = 198591846.

The previous prime is 198591793. The next prime is 198591863. The reversal of 198591847 is 748195891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198591847 - 2⁷ = 198591719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198591794 and 198591803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198591347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99295923 + 99295924.

It is an arithmetic number, because the mean of its divisors is an integer number (99295924).

Almost surely, 2^198591847 is an apocalyptic number.

198591847 is a deficient number, since it is larger than the sum of its proper divisors (1).

198591847 is an equidigital number, since it uses as much as digits as its factorization.

198591847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 52.

The square root of 198591847 is about 14092.2619547041. The cubic root of 198591847 is about 583.4278257448.

The spelling of 198591847 in words is "one hundred ninety-eight million, five hundred ninety-one thousand, eight hundred forty-seven".