991161199 has 8 divisors (see below), whose sum is σ = 1139539968. Its totient is φ = 844478520.

The previous prime is 991161191. The next prime is 991161203.

991161199 is nontrivially palindromic in base 10.

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 991161199 - 2³ = 991161191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991161191) 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, 422767 + ... + 425104.

It is an arithmetic number, because the mean of its divisors is an integer number (142442496).

Almost surely, 2^991161199 is an apocalyptic number.

991161199 is a deficient number, since it is larger than the sum of its proper divisors (148378769).

991161199 is a wasteful number, since it uses less digits than its factorization.

991161199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848045.

The product of its digits is 39366, while the sum is 46.

The square root of 991161199 is about 31482.7127007823. The cubic root of 991161199 is about 997.0450096329.

The spelling of 991161199 in words is "nine hundred ninety-one million, one hundred sixty-one thousand, one hundred ninety-nine".