2281666 has 12 divisors (see below), whose sum is σ = 3509622. Its totient is φ = 1112496.

The previous prime is 2281663. The next prime is 2281667. The reversal of 2281666 is 6661822.

It can be written as a sum of positive squares in only one way, i.e., 2265025 + 16641 = 1505^2 + 129^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2281661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3390 + ... + 4006.

2^2281666 is an apocalyptic number.

2281666 is a deficient number, since it is larger than the sum of its proper divisors (1227956).

2281666 is an equidigital number, since it uses as much as digits as its factorization.

2281666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705 (or 662 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 2281666 is about 1510.5184540415. The cubic root of 2281666 is about 131.6489370633.

The spelling of 2281666 in words is "two million, two hundred eighty-one thousand, six hundred sixty-six".