6550991 has 8 divisors (see below), whose sum is σ = 6939120. Its totient is φ = 6167232.

The previous prime is 6550981. The next prime is 6551011. The reversal of 6550991 is 1990556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6550991 - 2⁶ = 6550927 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 (6550981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2291 + ... + 4283.

It is an arithmetic number, because the mean of its divisors is an integer number (867390).

Almost surely, 2^6550991 is an apocalyptic number.

6550991 is a deficient number, since it is larger than the sum of its proper divisors (388129).

6550991 is a wasteful number, since it uses less digits than its factorization.

6550991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 6550991 is about 2559.4903789622. The cubic root of 6550991 is about 187.1122987390.

The spelling of 6550991 in words is "six million, five hundred fifty thousand, nine hundred ninety-one".