6641591 has 4 divisors (see below), whose sum is σ = 7245384. Its totient is φ = 6037800.

The previous prime is 6641587. The next prime is 6641633. The reversal of 6641591 is 1951466.

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

It is a cyclic number.

It is not a de Polignac number, because 6641591 - 2² = 6641587 is a prime.

It is a super-2 number, since 2×6641591² = 88221462022562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641501) 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, 301880 + ... + 301901.

It is an arithmetic number, because the mean of its divisors is an integer number (1811346).

Almost surely, 2^6641591 is an apocalyptic number.

6641591 is a deficient number, since it is larger than the sum of its proper divisors (603793).

6641591 is a wasteful number, since it uses less digits than its factorization.

6641591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603792.

The product of its digits is 6480, while the sum is 32.

The square root of 6641591 is about 2577.1284407262. The cubic root of 6641591 is about 187.9709382420.

The spelling of 6641591 in words is "six million, six hundred forty-one thousand, five hundred ninety-one".