16109855 has 4 divisors (see below), whose sum is σ = 19331832. Its totient is φ = 12887880.

The previous prime is 16109839. The next prime is 16109869. The reversal of 16109855 is 55890161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55890161 = 23 ⋅2430007.

It is not a de Polignac number, because 16109855 - 2⁴ = 16109839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610981 + ... + 1610990.

It is an arithmetic number, because the mean of its divisors is an integer number (4832958).

Almost surely, 2^16109855 is an apocalyptic number.

16109855 is a deficient number, since it is larger than the sum of its proper divisors (3221977).

16109855 is an equidigital number, since it uses as much as digits as its factorization.

16109855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221976.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 16109855 is about 4013.7083850225. The cubic root of 16109855 is about 252.5595977348.

The spelling of 16109855 in words is "sixteen million, one hundred nine thousand, eight hundred fifty-five".