2206681 has 2 divisors, whose sum is σ = 2206682. Its totient is φ = 2206680.

The previous prime is 2206669. The next prime is 2206709. The reversal of 2206681 is 1866022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2059225 + 147456 = 1435^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 2206681 - 2⁵ = 2206649 is a prime.

It is a super-2 number, since 2×2206681² = 9738882071522, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹¹ + 2¹⁹ + 0 + 6³ + 6⁸ + 8³ + 1 .

It is not a weakly prime, because it can be changed into another prime (2206601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1103340 + 1103341.

It is an arithmetic number, because the mean of its divisors is an integer number (1103341).

2^2206681 is an apocalyptic number.

It is an amenable number.

2206681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2206681 is an equidigital number, since it uses as much as digits as its factorization.

2206681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2206681 is about 1485.4901547974. The cubic root of 2206681 is about 130.1906669635.

The spelling of 2206681 in words is "two million, two hundred six thousand, six hundred eighty-one".