2166281 has 8 divisors (see below), whose sum is σ = 2366784. Its totient is φ = 1970640.

The previous prime is 2166251. The next prime is 2166289. The reversal of 2166281 is 1826612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166281 - 2¹⁴ = 2149897 is a prime.

It is a super-2 number, since 2×2166281² = 9385546741922, which contains 22 as substring.

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 2166281.

It is not an unprimeable number, because it can be changed into a prime (2166289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251 + ... + 2096.

It is an arithmetic number, because the mean of its divisors is an integer number (295848).

2^2166281 is an apocalyptic number.

It is an amenable number.

2166281 is a deficient number, since it is larger than the sum of its proper divisors (200503).

2166281 is a wasteful number, since it uses less digits than its factorization.

2166281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431.

The product of its digits is 1152, while the sum is 26.

The square root of 2166281 is about 1471.8291341049. The cubic root of 2166281 is about 129.3912564852.

The spelling of 2166281 in words is "two million, one hundred sixty-six thousand, two hundred eighty-one".