6654991 has 8 divisors (see below), whose sum is σ = 7681824. Its totient is φ = 5647200.

The previous prime is 6654979. The next prime is 6655001. The reversal of 6654991 is 1994566.

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 6654991 - 2¹⁹ = 6130703 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 (6654941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4000 + ... + 5413.

It is an arithmetic number, because the mean of its divisors is an integer number (960228).

Almost surely, 2^6654991 is an apocalyptic number.

6654991 is a deficient number, since it is larger than the sum of its proper divisors (1026833).

6654991 is a wasteful number, since it uses less digits than its factorization.

6654991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9521.

The product of its digits is 58320, while the sum is 40.

The square root of 6654991 is about 2579.7269235328. The cubic root of 6654991 is about 188.0972693422.

The spelling of 6654991 in words is "six million, six hundred fifty-four thousand, nine hundred ninety-one".