13991151 has 4 divisors (see below), whose sum is σ = 18654872. Its totient is φ = 9327432.

The previous prime is 13991147. The next prime is 13991167. The reversal of 13991151 is 15119931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15119931 = 3 ⋅5039977.

It is not a de Polignac number, because 13991151 - 2² = 13991147 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 (13991171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2331856 + ... + 2331861.

It is an arithmetic number, because the mean of its divisors is an integer number (4663718).

Almost surely, 2^13991151 is an apocalyptic number.

13991151 is a deficient number, since it is larger than the sum of its proper divisors (4663721).

13991151 is an equidigital number, since it uses as much as digits as its factorization.

13991151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4663720.

The product of its digits is 1215, while the sum is 30.

The square root of 13991151 is about 3740.4747024943. The cubic root of 13991151 is about 240.9634363129.

The spelling of 13991151 in words is "thirteen million, nine hundred ninety-one thousand, one hundred fifty-one".