199222991 has 18 divisors (see below), whose sum is σ = 222578160. Its totient is φ = 178181080.

The previous prime is 199222943. The next prime is 199222993.

It is a happy number.

199222991 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-199222991 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 (199222993) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 833450 + ... + 833688.

Almost surely, 2^199222991 is an apocalyptic number.

199222991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

199222991 is a deficient number, since it is larger than the sum of its proper divisors (23355169).

199222991 is an equidigital number, since it uses as much as digits as its factorization.

199222991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 333 counting only the distinct ones).

The product of its digits is 52488, while the sum is 44.

The square root of 199222991 is about 14114.6374732049. The cubic root of 199222991 is about 584.0452354011.

The spelling of 199222991 in words is "one hundred ninety-nine million, two hundred twenty-two thousand, nine hundred ninety-one".