16887133 has 4 divisors (see below), whose sum is σ = 17343580. Its totient is φ = 16430688.

The previous prime is 16887131. The next prime is 16887139. The reversal of 16887133 is 33178861.

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 16176484 + 710649 = 4022^2 + 843^2 .

It is a cyclic number.

It is not a de Polignac number, because 16887133 - 2¹ = 16887131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 456409 = 16887133 / (1 + 6 + 8 + 8 + 7 + 1 + 3 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16887092 and 16887101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16887131) 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, 228168 + ... + 228241.

It is an arithmetic number, because the mean of its divisors is an integer number (4335895).

Almost surely, 2^16887133 is an apocalyptic number.

It is an amenable number.

16887133 is a deficient number, since it is larger than the sum of its proper divisors (456447).

16887133 is an equidigital number, since it uses as much as digits as its factorization.

16887133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456446.

The product of its digits is 24192, while the sum is 37.

The square root of 16887133 is about 4109.3956976665. The cubic root of 16887133 is about 256.5578502765.

It can be divided in two parts, 16887 and 133, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 16887133 in words is "sixteen million, eight hundred eighty-seven thousand, one hundred thirty-three".