3640591 has 2 divisors, whose sum is σ = 3640592. Its totient is φ = 3640590.

The previous prime is 3640589. The next prime is 3640597. The reversal of 3640591 is 1950463.

It is a weak prime.

It is an emirp because it is prime and its reverse (1950463) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3640591 - 2¹ = 3640589 is a prime.

Together with 3640589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3640597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820295 + 1820296.

It is an arithmetic number, because the mean of its divisors is an integer number (1820296).

Almost surely, 2^3640591 is an apocalyptic number.

3640591 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640591 is an equidigital number, since it uses as much as digits as its factorization.

3640591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 3640591 is about 1908.0332806322. The cubic root of 3640591 is about 153.8357584450.

The spelling of 3640591 in words is "three million, six hundred forty thousand, five hundred ninety-one".