2668081 has 4 divisors (see below), whose sum is σ = 2873332. Its totient is φ = 2462832.

The previous prime is 2668063. The next prime is 2668091. The reversal of 2668081 is 1808662.

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

It can be written as a sum of positive squares in 2 ways, for example, as 665856 + 2002225 = 816^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 2668081 - 2⁹ = 2667569 is a prime.

It is a super-2 number, since 2×2668081² = 14237312445122, which contains 22 as substring.

It is a Duffinian number.

2668081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2668051) 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, 102606 + ... + 102631.

It is an arithmetic number, because the mean of its divisors is an integer number (718333).

2^2668081 is an apocalyptic number.

It is an amenable number.

2668081 is a deficient number, since it is larger than the sum of its proper divisors (205251).

2668081 is a wasteful number, since it uses less digits than its factorization.

2668081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205250.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 2668081 is about 1633.4261538251. The cubic root of 2668081 is about 138.6967666362.

The spelling of 2668081 in words is "two million, six hundred sixty-eight thousand, eighty-one".