5581591 has 2 divisors, whose sum is σ = 5581592. Its totient is φ = 5581590.

The previous prime is 5581553. The next prime is 5581603. The reversal of 5581591 is 1951855.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5581591 - 2⁷ = 5581463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5581531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2790795 + 2790796.

It is an arithmetic number, because the mean of its divisors is an integer number (2790796).

Almost surely, 2^5581591 is an apocalyptic number.

5581591 is a deficient number, since it is larger than the sum of its proper divisors (1).

5581591 is an equidigital number, since it uses as much as digits as its factorization.

5581591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 34.

The square root of 5581591 is about 2362.5391002055. The cubic root of 5581591 is about 177.3859983433.

It can be divided in two parts, 558 and 1591, that multiplied together give a triangular number (887778 = T₁₃₃₂).

The spelling of 5581591 in words is "five million, five hundred eighty-one thousand, five hundred ninety-one".