6331591 has 4 divisors (see below), whose sum is σ = 7236112. Its totient is φ = 5427072.

The previous prime is 6331573. The next prime is 6331603. The reversal of 6331591 is 1951336.

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

It is not a de Polignac number, because 6331591 - 2¹³ = 6323399 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 (6331571) 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 3 ways as a sum of consecutive naturals, for example, 452250 + ... + 452263.

It is an arithmetic number, because the mean of its divisors is an integer number (1809028).

Almost surely, 2^6331591 is an apocalyptic number.

6331591 is a deficient number, since it is larger than the sum of its proper divisors (904521).

6331591 is an equidigital number, since it uses as much as digits as its factorization.

6331591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904520.

The product of its digits is 2430, while the sum is 28.

The square root of 6331591 is about 2516.2652880807. The cubic root of 6331591 is about 184.9996688575. Note that the first 3 decimals are identical.

The spelling of 6331591 in words is "six million, three hundred thirty-one thousand, five hundred ninety-one".