6642289 has 2 divisors, whose sum is σ = 6642290. Its totient is φ = 6642288.

The previous prime is 6642283. The next prime is 6642299. The reversal of 6642289 is 9822466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6630625 + 11664 = 2575^2 + 108^2 .

It is a cyclic number.

It is not a de Polignac number, because 6642289 - 2³ = 6642281 is a prime.

It is not a weakly prime, because it can be changed into another prime (6642281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321144 + 3321145.

It is an arithmetic number, because the mean of its divisors is an integer number (3321145).

Almost surely, 2^6642289 is an apocalyptic number.

It is an amenable number.

6642289 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642289 is an equidigital number, since it uses as much as digits as its factorization.

6642289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 37.

The square root of 6642289 is about 2577.2638592119. The cubic root of 6642289 is about 187.9775229654.

It can be divided in two parts, 664 and 2289, that multiplied together give a triangular number (1519896 = T₁₇₄₃).

The spelling of 6642289 in words is "six million, six hundred forty-two thousand, two hundred eighty-nine".