200000991 has 8 divisors (see below), whose sum is σ = 266853040. Its totient is φ = 133241472.

The previous prime is 200000989. The next prime is 200001001. The reversal of 200000991 is 199000002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 200000991 - 2¹ = 200000989 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 (200000491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17920 + ... + 26853.

It is an arithmetic number, because the mean of its divisors is an integer number (33356630).

Almost surely, 2^200000991 is an apocalyptic number.

200000991 is a deficient number, since it is larger than the sum of its proper divisors (66852049).

200000991 is a wasteful number, since it uses less digits than its factorization.

200000991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46265.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 200000991 is about 14142.1706608286. The cubic root of 200000991 is about 584.8045135415.

Adding to 200000991 its reverse (199000002), we get a palindrome (399000993).

The spelling of 200000991 in words is "two hundred million, nine hundred ninety-one", and thus it is an aban number.