204194500091 has 2 divisors, whose sum is σ = 204194500092. Its totient is φ = 204194500090.

The previous prime is 204194500051. The next prime is 204194500121. The reversal of 204194500091 is 190005491402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204194500091 is a prime.

It is not a weakly prime, because it can be changed into another prime (204194500001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102097250045 + 102097250046.

It is an arithmetic number, because the mean of its divisors is an integer number (102097250046).

Almost surely, 2^204194500091 is an apocalyptic number.

204194500091 is a deficient number, since it is larger than the sum of its proper divisors (1).

204194500091 is an equidigital number, since it uses as much as digits as its factorization.

204194500091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

Adding to 204194500091 its reverse (190005491402), we get a palindrome (394199991493).

The spelling of 204194500091 in words is "two hundred four billion, one hundred ninety-four million, five hundred thousand, ninety-one".