6740521 has 4 divisors (see below), whose sum is σ = 6752592. Its totient is φ = 6728452.

The previous prime is 6740519. The next prime is 6740543. The reversal of 6740521 is 1250476.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6740521 - 2¹ = 6740519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6740501) 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, 5155 + ... + 6328.

It is an arithmetic number, because the mean of its divisors is an integer number (1688148).

Almost surely, 2^6740521 is an apocalyptic number.

It is an amenable number.

6740521 is a deficient number, since it is larger than the sum of its proper divisors (12071).

6740521 is a wasteful number, since it uses less digits than its factorization.

6740521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12070.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 6740521 is about 2596.2513360613. The cubic root of 6740521 is about 188.8996509183.

Adding to 6740521 its reverse (1250476), we get a palindrome (7990997).

The spelling of 6740521 in words is "six million, seven hundred forty thousand, five hundred twenty-one".