6601591 has 4 divisors (see below), whose sum is σ = 6614784. Its totient is φ = 6588400.

The previous prime is 6601561. The next prime is 6601601. The reversal of 6601591 is 1951066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6601591 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 (6601501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5815 + ... + 6856.

It is an arithmetic number, because the mean of its divisors is an integer number (1653696).

Almost surely, 2^6601591 is an apocalyptic number.

6601591 is a deficient number, since it is larger than the sum of its proper divisors (13193).

6601591 is a wasteful number, since it uses less digits than its factorization.

6601591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13192.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 6601591 is about 2569.3561450293. The cubic root of 6601591 is about 187.5928168607.

The spelling of 6601591 in words is "six million, six hundred one thousand, five hundred ninety-one".