16681771 has 4 divisors (see below), whose sum is σ = 16742272. Its totient is φ = 16621272.

The previous prime is 16681733. The next prime is 16681781. The reversal of 16681771 is 17718661.

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

It is a cyclic number.

It is not a de Polignac number, because 16681771 - 2¹⁹ = 16157483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16681771.

It is not an unprimeable number, because it can be changed into a prime (16681781) 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, 29835 + ... + 30388.

It is an arithmetic number, because the mean of its divisors is an integer number (4185568).

Almost surely, 2^16681771 is an apocalyptic number.

16681771 is a deficient number, since it is larger than the sum of its proper divisors (60501).

16681771 is an equidigital number, since it uses as much as digits as its factorization.

16681771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60500.

The product of its digits is 14112, while the sum is 37.

The square root of 16681771 is about 4084.3323811854. The cubic root of 16681771 is about 255.5136181201.

The spelling of 16681771 in words is "sixteen million, six hundred eighty-one thousand, seven hundred seventy-one".