205698091 has 2 divisors, whose sum is σ = 205698092. Its totient is φ = 205698090.

The previous prime is 205698071. The next prime is 205698127. The reversal of 205698091 is 190896502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205698091 - 2¹³ = 205689899 is a prime.

It is not a weakly prime, because it can be changed into another prime (205698001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102849045 + 102849046.

It is an arithmetic number, because the mean of its divisors is an integer number (102849046).

Almost surely, 2^205698091 is an apocalyptic number.

205698091 is a deficient number, since it is larger than the sum of its proper divisors (1).

205698091 is an equidigital number, since it uses as much as digits as its factorization.

205698091 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 40.

The square root of 205698091 is about 14342.1787396476. The cubic root of 205698091 is about 590.3053968099.

The spelling of 205698091 in words is "two hundred five million, six hundred ninety-eight thousand, ninety-one".