16811139 has 4 divisors (see below), whose sum is σ = 22414856. Its totient is φ = 11207424.

The previous prime is 16811131. The next prime is 16811153. The reversal of 16811139 is 93111861.

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

It is not a de Polignac number, because 16811139 - 2³ = 16811131 is a prime.

It is a super-2 number, since 2×16811139² = 565228788954642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16811131) 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, 2801854 + ... + 2801859.

It is an arithmetic number, because the mean of its divisors is an integer number (5603714).

Almost surely, 2^16811139 is an apocalyptic number.

16811139 is a deficient number, since it is larger than the sum of its proper divisors (5603717).

16811139 is an equidigital number, since it uses as much as digits as its factorization.

16811139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603716.

The product of its digits is 1296, while the sum is 30.

The square root of 16811139 is about 4100.1389000862. The cubic root of 16811139 is about 256.1724251399.

The spelling of 16811139 in words is "sixteen million, eight hundred eleven thousand, one hundred thirty-nine".