2166731 has 8 divisors (see below), whose sum is σ = 2527200. Its totient is φ = 1856904.

The previous prime is 2166721. The next prime is 2166763. The reversal of 2166731 is 1376612.

2166731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2166731 - 2¹⁰ = 2165707 is a prime.

It is a super-2 number, since 2×2166731² = 9389446452722, 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 2166731.

It is not an unprimeable number, because it can be changed into a prime (2166721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2816 + ... + 3501.

It is an arithmetic number, because the mean of its divisors is an integer number (315900).

2^2166731 is an apocalyptic number.

2166731 is a deficient number, since it is larger than the sum of its proper divisors (360469).

2166731 is an frugal number, since it uses more digits than its factorization.

2166731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6338 (or 6324 counting only the distinct ones).

The product of its digits is 1512, while the sum is 26.

The square root of 2166731 is about 1471.9819971725. The cubic root of 2166731 is about 129.4002153159.

The spelling of 2166731 in words is "two million, one hundred sixty-six thousand, seven hundred thirty-one".