6542621 has 2 divisors, whose sum is σ = 6542622. Its totient is φ = 6542620.

The previous prime is 6542611. The next prime is 6542633. The reversal of 6542621 is 1262456.

6542621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6446521 + 96100 = 2539^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 6542621 - 2¹⁰ = 6541597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6542611) 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, 3271310 + 3271311.

It is an arithmetic number, because the mean of its divisors is an integer number (3271311).

Almost surely, 2^6542621 is an apocalyptic number.

It is an amenable number.

6542621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6542621 is an equidigital number, since it uses as much as digits as its factorization.

6542621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 26.

The square root of 6542621 is about 2557.8547652281. The cubic root of 6542621 is about 187.0325755636.

The spelling of 6542621 in words is "six million, five hundred forty-two thousand, six hundred twenty-one".