2212561 has 4 divisors (see below), whose sum is σ = 2382772. Its totient is φ = 2042352.

The previous prime is 2212547. The next prime is 2212571. The reversal of 2212561 is 1652122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1652122 = 2 ⋅826061.

It can be written as a sum of positive squares in 2 ways, for example, as 1252161 + 960400 = 1119^2 + 980^2 .

It is not a de Polignac number, because 2212561 - 2⁷ = 2212433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2212571) 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, 85086 + ... + 85111.

It is an arithmetic number, because the mean of its divisors is an integer number (595693).

2^2212561 is an apocalyptic number.

It is an amenable number.

2212561 is a deficient number, since it is larger than the sum of its proper divisors (170211).

2212561 is a wasteful number, since it uses less digits than its factorization.

2212561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170210.

The product of its digits is 240, while the sum is 19.

The square root of 2212561 is about 1487.4679828487. The cubic root of 2212561 is about 130.3062012858.

Adding to 2212561 its reverse (1652122), we get a palindrome (3864683).

The spelling of 2212561 in words is "two million, two hundred twelve thousand, five hundred sixty-one".