2581559 has 2 divisors, whose sum is σ = 2581560. Its totient is φ = 2581558.

The previous prime is 2581541. The next prime is 2581561. The reversal of 2581559 is 9551852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2581559 - 2²⁰ = 1532983 is a prime.

Together with 2581561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2584559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290779 + 1290780.

It is an arithmetic number, because the mean of its divisors is an integer number (1290780).

2^2581559 is an apocalyptic number.

2581559 is a deficient number, since it is larger than the sum of its proper divisors (1).

2581559 is an equidigital number, since it uses as much as digits as its factorization.

2581559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 35.

The square root of 2581559 is about 1606.7230626340. The cubic root of 2581559 is about 137.1810170452.

The spelling of 2581559 in words is "two million, five hundred eighty-one thousand, five hundred fifty-nine".