11998191 has 8 divisors (see below), whose sum is σ = 16087680. Its totient is φ = 7953752.

The previous prime is 11998187. The next prime is 11998201. The reversal of 11998191 is 19189911.

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 11998191 - 2² = 11998187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11998121) 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, 10635 + ... + 11708.

It is an arithmetic number, because the mean of its divisors is an integer number (2010960).

Almost surely, 2^11998191 is an apocalyptic number.

11998191 is a deficient number, since it is larger than the sum of its proper divisors (4089489).

11998191 is a wasteful number, since it uses less digits than its factorization.

11998191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22525.

The product of its digits is 5832, while the sum is 39.

The square root of 11998191 is about 3463.8404986373. The cubic root of 11998191 is about 228.9313435544.

The spelling of 11998191 in words is "eleven million, nine hundred ninety-eight thousand, one hundred ninety-one".