13999181 has 16 divisors (see below), whose sum is σ = 17103360. Its totient is φ = 11190960.

The previous prime is 13999171. The next prime is 13999189. The reversal of 13999181 is 18199931.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13999181 is a prime.

It is a super-2 number, since 2×13999181² = 391954137341522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13999189) 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 15 ways as a sum of consecutive naturals, for example, 8126 + ... + 9696.

It is an arithmetic number, because the mean of its divisors is an integer number (1068960).

Almost surely, 2^13999181 is an apocalyptic number.

It is an amenable number.

13999181 is a deficient number, since it is larger than the sum of its proper divisors (3104179).

13999181 is a wasteful number, since it uses less digits than its factorization.

13999181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664.

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

The square root of 13999181 is about 3741.5479416947. The cubic root of 13999181 is about 241.0095265485.

The spelling of 13999181 in words is "thirteen million, nine hundred ninety-nine thousand, one hundred eighty-one".