6578991 has 6 divisors (see below), whose sum is σ = 9503000. Its totient is φ = 4385988.

The previous prime is 6578987. The next prime is 6579019. The reversal of 6578991 is 1998756.

6578991 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6578991 - 2² = 6578987 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 (6578291) 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, 365491 + ... + 365508.

Almost surely, 2^6578991 is an apocalyptic number.

6578991 is a deficient number, since it is larger than the sum of its proper divisors (2924009).

6578991 is a wasteful number, since it uses less digits than its factorization.

6578991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731005 (or 731002 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 6578991 is about 2564.9543855593. The cubic root of 6578991 is about 187.3785026217.

It can be divided in two parts, 6578 and 991, that added together give a square (7569 = 87²).

The spelling of 6578991 in words is "six million, five hundred seventy-eight thousand, nine hundred ninety-one".