13855691 has 4 divisors (see below), whose sum is σ = 13887000. Its totient is φ = 13824384.

The previous prime is 13855679. The next prime is 13855703. The reversal of 13855691 is 19655831.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (13855679) and next prime (13855703).

It is a cyclic number.

It is not a de Polignac number, because 13855691 - 2⁶ = 13855627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13855651) 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, 14981 + ... + 15878.

It is an arithmetic number, because the mean of its divisors is an integer number (3471750).

Almost surely, 2^13855691 is an apocalyptic number.

13855691 is a deficient number, since it is larger than the sum of its proper divisors (31309).

13855691 is an equidigital number, since it uses as much as digits as its factorization.

13855691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31308.

The product of its digits is 32400, while the sum is 38.

The square root of 13855691 is about 3722.3233336184. The cubic root of 13855691 is about 240.1832570254.

The spelling of 13855691 in words is "thirteen million, eight hundred fifty-five thousand, six hundred ninety-one".