4391591 has 2 divisors, whose sum is σ = 4391592. Its totient is φ = 4391590.

The previous prime is 4391587. The next prime is 4391609. The reversal of 4391591 is 1951934.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4391591 - 2² = 4391587 is a prime.

It is a super-2 number, since 2×4391591² = 38572143022562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4391521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2195795 + 2195796.

It is an arithmetic number, because the mean of its divisors is an integer number (2195796).

Almost surely, 2^4391591 is an apocalyptic number.

4391591 is a deficient number, since it is larger than the sum of its proper divisors (1).

4391591 is an equidigital number, since it uses as much as digits as its factorization.

4391591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 32.

The square root of 4391591 is about 2095.6123210174. The cubic root of 4391591 is about 163.7597985707.

The spelling of 4391591 in words is "four million, three hundred ninety-one thousand, five hundred ninety-one".