200000090991 has 4 divisors (see below), whose sum is σ = 266666787992. Its totient is φ = 133333393992.

The previous prime is 200000090989. The next prime is 200000090993. The reversal of 200000090991 is 199090000002.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (200000090989) and next prime (200000090993).

It is not a de Polignac number, because 200000090991 - 2¹ = 200000090989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200000090993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33333348496 + ... + 33333348501.

It is an arithmetic number, because the mean of its divisors is an integer number (66666696998).

Almost surely, 2^200000090991 is an apocalyptic number.

200000090991 is a deficient number, since it is larger than the sum of its proper divisors (66666697001).

200000090991 is an equidigital number, since it uses as much as digits as its factorization.

200000090991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66666697000.

The product of its (nonzero) digits is 1458, while the sum is 30.

Adding to 200000090991 its reverse (199090000002), we get a palindrome (399090090993).

The spelling of 200000090991 in words is "two hundred billion, ninety thousand, nine hundred ninety-one".