2643569 has 2 divisors, whose sum is σ = 2643570. Its totient is φ = 2643568.

The previous prime is 2643559. The next prime is 2643581. The reversal of 2643569 is 9653462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2608225 + 35344 = 1615^2 + 188^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2643569 is a prime.

It is a super-2 number, since 2×2643569² = 13976914115522, which contains 22 as substring.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2⁹ + 6² + 4¹⁰ + 3¹³ + 5 + 6² + 9² .

It is not a weakly prime, because it can be changed into another prime (2643559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321784 + 1321785.

It is an arithmetic number, because the mean of its divisors is an integer number (1321785).

2^2643569 is an apocalyptic number.

It is an amenable number.

2643569 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643569 is an equidigital number, since it uses as much as digits as its factorization.

2643569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The square root of 2643569 is about 1625.9055938153. The cubic root of 2643569 is about 138.2707176174.

The spelling of 2643569 in words is "two million, six hundred forty-three thousand, five hundred sixty-nine".