6616591 has 2 divisors, whose sum is σ = 6616592. Its totient is φ = 6616590.

The previous prime is 6616583. The next prime is 6616601. The reversal of 6616591 is 1956166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6616591 - 2³ = 6616583 is a prime.

It is a super-2 number, since 2×6616591² = 87558552922562, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6616531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3308295 + 3308296.

It is an arithmetic number, because the mean of its divisors is an integer number (3308296).

Almost surely, 2^6616591 is an apocalyptic number.

6616591 is a deficient number, since it is larger than the sum of its proper divisors (1).

6616591 is an equidigital number, since it uses as much as digits as its factorization.

6616591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 6616591 is about 2572.2735080080. The cubic root of 6616591 is about 187.7347909049.

The spelling of 6616591 in words is "six million, six hundred sixteen thousand, five hundred ninety-one".