2220761 has 4 divisors (see below), whose sum is σ = 2351412. Its totient is φ = 2090112.

The previous prime is 2220749. The next prime is 2220773. The reversal of 2220761 is 1670222.

2220761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (2220749) and next prime (2220773).

It can be written as a sum of positive squares in 2 ways, for example, as 912025 + 1308736 = 955^2 + 1144^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220761 - 2⁶ = 2220697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2220731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65300 + ... + 65333.

It is an arithmetic number, because the mean of its divisors is an integer number (587853).

2^2220761 is an apocalyptic number.

It is an amenable number.

2220761 is a deficient number, since it is larger than the sum of its proper divisors (130651).

2220761 is a wasteful number, since it uses less digits than its factorization.

2220761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130650.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 2220761 is about 1490.2217955727. The cubic root of 2220761 is about 130.4669793095.

Adding to 2220761 its reverse (1670222), we get a palindrome (3890983).

The spelling of 2220761 in words is "two million, two hundred twenty thousand, seven hundred sixty-one".