6731591 has 2 divisors, whose sum is σ = 6731592. Its totient is φ = 6731590.

The previous prime is 6731579. The next prime is 6731597. The reversal of 6731591 is 1951376.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6731591 - 2²² = 2537287 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6731597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3365795 + 3365796.

It is an arithmetic number, because the mean of its divisors is an integer number (3365796).

Almost surely, 2^6731591 is an apocalyptic number.

6731591 is a deficient number, since it is larger than the sum of its proper divisors (1).

6731591 is an equidigital number, since it uses as much as digits as its factorization.

6731591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 32.

The square root of 6731591 is about 2594.5309788091. The cubic root of 6731591 is about 188.8161944927.

The spelling of 6731591 in words is "six million, seven hundred thirty-one thousand, five hundred ninety-one".