2561217 has 4 divisors (see below), whose sum is σ = 3414960. Its totient is φ = 1707476.

The previous prime is 2561201. The next prime is 2561227. The reversal of 2561217 is 7121652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2561217 - 2⁴ = 2561201 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2561227) 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, 426867 + ... + 426872.

It is an arithmetic number, because the mean of its divisors is an integer number (853740).

2^2561217 is an apocalyptic number.

It is an amenable number.

2561217 is a deficient number, since it is larger than the sum of its proper divisors (853743).

2561217 is an equidigital number, since it uses as much as digits as its factorization.

2561217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853742.

The product of its digits is 840, while the sum is 24.

The square root of 2561217 is about 1600.3802673115. The cubic root of 2561217 is about 136.8197498075.

Adding to 2561217 its reverse (7121652), we get a palindrome (9682869).

The spelling of 2561217 in words is "two million, five hundred sixty-one thousand, two hundred seventeen".