6542491 has 2 divisors, whose sum is σ = 6542492. Its totient is φ = 6542490.

The previous prime is 6542489. The next prime is 6542513. The reversal of 6542491 is 1942456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6542491 - 2¹ = 6542489 is a prime.

Together with 6542489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6542401) 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, 3271245 + 3271246.

It is an arithmetic number, because the mean of its divisors is an integer number (3271246).

Almost surely, 2^6542491 is an apocalyptic number.

6542491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6542491 is an equidigital number, since it uses as much as digits as its factorization.

6542491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 6542491 is about 2557.8293531821. The cubic root of 6542491 is about 187.0313367942.

The spelling of 6542491 in words is "six million, five hundred forty-two thousand, four hundred ninety-one".