13991249 has 4 divisors (see below), whose sum is σ = 14085300. Its totient is φ = 13897200.

The previous prime is 13991233. The next prime is 13991251. The reversal of 13991249 is 94219931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94219931 = 13 ⋅7247687.

It can be written as a sum of positive squares in 2 ways, for example, as 4870849 + 9120400 = 2207^2 + 3020^2 .

It is a cyclic number.

It is not a de Polignac number, because 13991249 - 2⁴ = 13991233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13991279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46802 + ... + 47099.

It is an arithmetic number, because the mean of its divisors is an integer number (3521325).

Almost surely, 2^13991249 is an apocalyptic number.

It is an amenable number.

13991249 is a deficient number, since it is larger than the sum of its proper divisors (94051).

13991249 is an equidigital number, since it uses as much as digits as its factorization.

13991249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94050.

The product of its digits is 17496, while the sum is 38.

The square root of 13991249 is about 3740.4878024129. The cubic root of 13991249 is about 240.9639989152.

The spelling of 13991249 in words is "thirteen million, nine hundred ninety-one thousand, two hundred forty-nine".