2643217 has 4 divisors (see below), whose sum is σ = 2682736. Its totient is φ = 2603700.

The previous prime is 2643209. The next prime is 2643227. The reversal of 2643217 is 7123462.

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 2643217 - 2³ = 2643209 is a prime.

It is a super-2 number, since 2×2643217² = 13973192218178, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹³ + 6⁸ + 4³ + 3⁶ + 2¹⁷ + 1 + 7⁷ .

It is a Duffinian number.

2643217 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2643191 and 2643200.

It is not an unprimeable number, because it can be changed into a prime (2643227) 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, 19659 + ... + 19792.

It is an arithmetic number, because the mean of its divisors is an integer number (670684).

2^2643217 is an apocalyptic number.

It is an amenable number.

2643217 is a deficient number, since it is larger than the sum of its proper divisors (39519).

2643217 is an equidigital number, since it uses as much as digits as its factorization.

2643217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39518.

The product of its digits is 2016, while the sum is 25.

The square root of 2643217 is about 1625.7973428444. The cubic root of 2643217 is about 138.2645802764.

Adding to 2643217 its reverse (7123462), we get a palindrome (9766679).

It can be divided in two parts, 264 and 3217, that added together give a square (3481 = 59²).

The spelling of 2643217 in words is "two million, six hundred forty-three thousand, two hundred seventeen".