6540791 has 4 divisors (see below), whose sum is σ = 6588672. Its totient is φ = 6492912.

The previous prime is 6540739. The next prime is 6540827. The reversal of 6540791 is 1970456.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6540791 - 2¹⁴ = 6524407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23735 + ... + 24008.

It is an arithmetic number, because the mean of its divisors is an integer number (1647168).

Almost surely, 2^6540791 is an apocalyptic number.

6540791 is a deficient number, since it is larger than the sum of its proper divisors (47881).

6540791 is a wasteful number, since it uses less digits than its factorization.

6540791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47880.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 6540791 is about 2557.4970185711. The cubic root of 6540791 is about 187.0151359916.

The spelling of 6540791 in words is "six million, five hundred forty thousand, seven hundred ninety-one".