6509993 has 6 divisors (see below), whose sum is σ = 7572906. Its totient is φ = 5579952.

The previous prime is 6509977. The next prime is 6510011. The reversal of 6509993 is 3999056.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6492304 + 17689 = 2548^2 + 133^2 .

It is not a de Polignac number, because 6509993 - 2⁴ = 6509977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6509993.

It is not an unprimeable number, because it can be changed into a prime (6509903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66380 + ... + 66477.

It is an arithmetic number, because the mean of its divisors is an integer number (1262151).

Almost surely, 2^6509993 is an apocalyptic number.

It is an amenable number.

6509993 is a deficient number, since it is larger than the sum of its proper divisors (1062913).

6509993 is a wasteful number, since it uses less digits than its factorization.

6509993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132871 (or 132864 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 6509993 is about 2551.4687926761. The cubic root of 6509993 is about 186.7211472922.

The spelling of 6509993 in words is "six million, five hundred nine thousand, nine hundred ninety-three".