2722081 has 4 divisors (see below), whose sum is σ = 2740500. Its totient is φ = 2703664.

The previous prime is 2722067. The next prime is 2722087. The reversal of 2722081 is 1802272.

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 1083681 + 1638400 = 1041^2 + 1280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2722081 is a prime.

It is a super-2 number, since 2×2722081² = 14819449941122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2722087) 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, 8986 + ... + 9283.

It is an arithmetic number, because the mean of its divisors is an integer number (685125).

2^2722081 is an apocalyptic number.

It is an amenable number.

2722081 is a deficient number, since it is larger than the sum of its proper divisors (18419).

2722081 is a wasteful number, since it uses less digits than its factorization.

2722081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18418.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 2722081 is about 1649.8730254174. The cubic root of 2722081 is about 139.6262308982.

The spelling of 2722081 in words is "two million, seven hundred twenty-two thousand, eighty-one".