13669881 has 4 divisors (see below), whose sum is σ = 18226512. Its totient is φ = 9113252.

The previous prime is 13669861. The next prime is 13669891. The reversal of 13669881 is 18896631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13669881 - 2⁷ = 13669753 is a prime.

It is a super-2 number, since 2×13669881² = 373731293108322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13669801) 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 3 ways as a sum of consecutive naturals, for example, 2278311 + ... + 2278316.

It is an arithmetic number, because the mean of its divisors is an integer number (4556628).

Almost surely, 2^13669881 is an apocalyptic number.

It is an amenable number.

13669881 is a deficient number, since it is larger than the sum of its proper divisors (4556631).

13669881 is an equidigital number, since it uses as much as digits as its factorization.

13669881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4556630.

The product of its digits is 62208, while the sum is 42.

The square root of 13669881 is about 3697.2802165917. The cubic root of 13669881 is about 239.1047724897.

The spelling of 13669881 in words is "thirteen million, six hundred sixty-nine thousand, eight hundred eighty-one".