6623591 has 24 divisors (see below), whose sum is σ = 7942704. Its totient is φ = 5483520.

The previous prime is 6623581. The next prime is 6623611. The reversal of 6623591 is 1953266.

It is a happy number.

It is not a de Polignac number, because 6623591 - 2¹⁴ = 6607207 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6623521) 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 23 ways as a sum of consecutive naturals, for example, 154016 + ... + 154058.

It is an arithmetic number, because the mean of its divisors is an integer number (330946).

Almost surely, 2^6623591 is an apocalyptic number.

6623591 is a deficient number, since it is larger than the sum of its proper divisors (1319113).

6623591 is a wasteful number, since it uses less digits than its factorization.

6623591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 114 counting only the distinct ones).

The product of its digits is 9720, while the sum is 32.

The square root of 6623591 is about 2573.6338123362. The cubic root of 6623591 is about 187.8009720334.

It can be divided in two parts, 6623 and 591, that multiplied together give a palindrome (3914193).

The spelling of 6623591 in words is "six million, six hundred twenty-three thousand, five hundred ninety-one".