199110010991 has 8 divisors (see below), whose sum is σ = 202505802000. Its totient is φ = 195714921600.

The previous prime is 199110010961. The next prime is 199110010999. The reversal of 199110010991 is 199010011991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 199110010991 - 2²² = 199105816687 is a prime.

It is a super-2 number, since 2×199110010991² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199110010999) 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, 413735 + ... + 754583.

It is an arithmetic number, because the mean of its divisors is an integer number (25313225250).

Almost surely, 2^199110010991 is an apocalyptic number.

199110010991 is a deficient number, since it is larger than the sum of its proper divisors (3395791009).

199110010991 is an equidigital number, since it uses as much as digits as its factorization.

199110010991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350809.

The product of its (nonzero) digits is 6561, while the sum is 41.

The spelling of 199110010991 in words is "one hundred ninety-nine billion, one hundred ten million, ten thousand, nine hundred ninety-one".