206198591 has 2 divisors, whose sum is σ = 206198592. Its totient is φ = 206198590.

The previous prime is 206198581. The next prime is 206198599. The reversal of 206198591 is 195891602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206198591 - 2¹⁰ = 206197567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206198599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103099295 + 103099296.

It is an arithmetic number, because the mean of its divisors is an integer number (103099296).

Almost surely, 2^206198591 is an apocalyptic number.

206198591 is a deficient number, since it is larger than the sum of its proper divisors (1).

206198591 is an equidigital number, since it uses as much as digits as its factorization.

206198591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 206198591 is about 14359.6166731567. The cubic root of 206198591 is about 590.7837816559.

The spelling of 206198591 in words is "two hundred six million, one hundred ninety-eight thousand, five hundred ninety-one".