8551591 has 2 divisors, whose sum is σ = 8551592. Its totient is φ = 8551590.

The previous prime is 8551579. The next prime is 8551601. The reversal of 8551591 is 1951558.

8551591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8551591 - 2⁹ = 8551079 is a prime.

8551591 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8551511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4275795 + 4275796.

It is an arithmetic number, because the mean of its divisors is an integer number (4275796).

Almost surely, 2^8551591 is an apocalyptic number.

8551591 is a deficient number, since it is larger than the sum of its proper divisors (1).

8551591 is an equidigital number, since it uses as much as digits as its factorization.

8551591 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 8551591 is about 2924.3103460474. The cubic root of 8551591 is about 204.4948179692.

The spelling of 8551591 in words is "eight million, five hundred fifty-one thousand, five hundred ninety-one".