6516749 has 4 divisors (see below), whose sum is σ = 6542364. Its totient is φ = 6491136.

The previous prime is 6516743. The next prime is 6516761. The reversal of 6516749 is 9476156.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4761124 + 1755625 = 2182^2 + 1325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6516749 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 (6516743) 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, 12422 + ... + 12935.

It is an arithmetic number, because the mean of its divisors is an integer number (1635591).

Almost surely, 2^6516749 is an apocalyptic number.

It is an amenable number.

6516749 is a deficient number, since it is larger than the sum of its proper divisors (25615).

6516749 is a wasteful number, since it uses less digits than its factorization.

6516749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25614.

The product of its digits is 45360, while the sum is 38.

The square root of 6516749 is about 2552.7923926555. The cubic root of 6516749 is about 186.7857173532.

The spelling of 6516749 in words is "six million, five hundred sixteen thousand, seven hundred forty-nine".