6744991 has 4 divisors (see below), whose sum is σ = 7358184. Its totient is φ = 6131800.

The previous prime is 6744979. The next prime is 6745001. The reversal of 6744991 is 1994476.

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 6744991 - 2¹³ = 6736799 is a prime.

It is an Ulam number.

It is a Duffinian number.

6744991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6744901) 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, 306580 + ... + 306601.

It is an arithmetic number, because the mean of its divisors is an integer number (1839546).

Almost surely, 2^6744991 is an apocalyptic number.

6744991 is a deficient number, since it is larger than the sum of its proper divisors (613193).

6744991 is a wasteful number, since it uses less digits than its factorization.

6744991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613192.

The product of its digits is 54432, while the sum is 40.

The square root of 6744991 is about 2597.1120499509. The cubic root of 6744991 is about 188.9413981787.

It can be divided in two parts, 674 and 4991, that added together give a palindrome (5665).

The spelling of 6744991 in words is "six million, seven hundred forty-four thousand, nine hundred ninety-one".