6642149 has 2 divisors, whose sum is σ = 6642150. Its totient is φ = 6642148.

The previous prime is 6642143. The next prime is 6642151. The reversal of 6642149 is 9412466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6604900 + 37249 = 2570^2 + 193^2 .

It is a cyclic number.

It is not a de Polignac number, because 6642149 - 2¹⁶ = 6576613 is a prime.

Together with 6642151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6642143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321074 + 3321075.

It is an arithmetic number, because the mean of its divisors is an integer number (3321075).

Almost surely, 2^6642149 is an apocalyptic number.

It is an amenable number.

6642149 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642149 is an equidigital number, since it uses as much as digits as its factorization.

6642149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 6642149 is about 2577.2366984815. The cubic root of 6642149 is about 187.9762022842.

The spelling of 6642149 in words is "six million, six hundred forty-two thousand, one hundred forty-nine".