13997751 has 4 divisors (see below), whose sum is σ = 18663672. Its totient is φ = 9331832.

The previous prime is 13997741. The next prime is 13997759. The reversal of 13997751 is 15779931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15779931 = 3 ⋅5259977.

It is a cyclic number.

It is not a de Polignac number, because 13997751 - 2⁵ = 13997719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13997759) 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, 2332956 + ... + 2332961.

It is an arithmetic number, because the mean of its divisors is an integer number (4665918).

Almost surely, 2^13997751 is an apocalyptic number.

13997751 is a deficient number, since it is larger than the sum of its proper divisors (4665921).

13997751 is an equidigital number, since it uses as much as digits as its factorization.

13997751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4665920.

The product of its digits is 59535, while the sum is 42.

The square root of 13997751 is about 3741.3568394367. The cubic root of 13997751 is about 241.0013199884.

The spelling of 13997751 in words is "thirteen million, nine hundred ninety-seven thousand, seven hundred fifty-one".