6542391 has 4 divisors (see below), whose sum is σ = 8723192. Its totient is φ = 4361592.

The previous prime is 6542387. The next prime is 6542401. The reversal of 6542391 is 1932456.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6542391 - 2² = 6542387 is a prime.

It is a D-number.

It is a Duffinian number.

6542391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6542351) 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 in 3 ways as a sum of consecutive naturals, for example, 1090396 + ... + 1090401.

It is an arithmetic number, because the mean of its divisors is an integer number (2180798).

Almost surely, 2^6542391 is an apocalyptic number.

6542391 is a deficient number, since it is larger than the sum of its proper divisors (2180801).

6542391 is a wasteful number, since it uses less digits than its factorization.

6542391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2180800.

The product of its digits is 6480, while the sum is 30.

The square root of 6542391 is about 2557.8098052826. The cubic root of 6542391 is about 187.0303838835.

The spelling of 6542391 in words is "six million, five hundred forty-two thousand, three hundred ninety-one".