581551 has 2 divisors, whose sum is σ = 581552. Its totient is φ = 581550.

The previous prime is 581549. The next prime is 581557. The reversal of 581551 is 155185.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 581551 - 2¹ = 581549 is a prime.

Together with 581549, 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 (581557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290775 + 290776.

It is an arithmetic number, because the mean of its divisors is an integer number (290776).

2⁵⁸¹⁵⁵¹ is an apocalyptic number.

581551 is a deficient number, since it is larger than the sum of its proper divisors (1).

581551 is an equidigital number, since it uses as much as digits as its factorization.

581551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000, while the sum is 25.

The square root of 581551 is about 762.5949121257. The cubic root of 581551 is about 83.4697800212.

The spelling of 581551 in words is "five hundred eighty-one thousand, five hundred fifty-one".