13198991 has 8 divisors (see below), whose sum is σ = 14319984. Its totient is φ = 12093120.

The previous prime is 13198981. The next prime is 13198993. The reversal of 13198991 is 19989131.

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 13198991 - 2²² = 9004687 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 (13198993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1925 + ... + 5486.

It is an arithmetic number, because the mean of its divisors is an integer number (1789998).

Almost surely, 2^13198991 is an apocalyptic number.

13198991 is a deficient number, since it is larger than the sum of its proper divisors (1120993).

13198991 is a wasteful number, since it uses less digits than its factorization.

13198991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7561.

The product of its digits is 17496, while the sum is 41.

The square root of 13198991 is about 3633.0415632084. The cubic root of 13198991 is about 236.3271282191.

The spelling of 13198991 in words is "thirteen million, one hundred ninety-eight thousand, nine hundred ninety-one".