2220881 has 4 divisors (see below), whose sum is σ = 2391732. Its totient is φ = 2050032.

The previous prime is 2220839. The next prime is 2220887. The reversal of 2220881 is 1880222.

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 819025 + 1401856 = 905^2 + 1184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2220881 is a prime.

It is a super-2 number, since 2×2220881² = 9864624832322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2220887) 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, 85406 + ... + 85431.

It is an arithmetic number, because the mean of its divisors is an integer number (597933).

2^2220881 is an apocalyptic number.

It is an amenable number.

2220881 is a deficient number, since it is larger than the sum of its proper divisors (170851).

2220881 is a wasteful number, since it uses less digits than its factorization.

2220881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170850.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 2220881 is about 1490.2620574919. The cubic root of 2220881 is about 130.4693292180.

The spelling of 2220881 in words is "two million, two hundred twenty thousand, eight hundred eighty-one".