16106809 has 4 divisors (see below), whose sum is σ = 16499700. Its totient is φ = 15713920.

The previous prime is 16106807. The next prime is 16106869. The reversal of 16106809 is 90860161.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3168400 + 12938409 = 1780^2 + 3597^2 .

It is a cyclic number.

It is not a de Polignac number, because 16106809 - 2¹ = 16106807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16106807) 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, 196384 + ... + 196465.

It is an arithmetic number, because the mean of its divisors is an integer number (4124925).

Almost surely, 2^16106809 is an apocalyptic number.

It is an amenable number.

16106809 is a deficient number, since it is larger than the sum of its proper divisors (392891).

16106809 is an equidigital number, since it uses as much as digits as its factorization.

16106809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392890.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 16106809 is about 4013.3289174948. The cubic root of 16106809 is about 252.5436790104.

The spelling of 16106809 in words is "sixteen million, one hundred six thousand, eight hundred nine".