25579 has 2 divisors, whose sum is σ = 25580.
Its totient is φ = 25578.
The previous prime is 25577. The next prime is 25583. The reversal of 25579 is 97552.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 25579 - 21 = 25577 is a prime.
Together with 25577, it forms a pair of twin primes.
It is a Chen prime.
It is a plaindrome in base 10.
It is not a weakly prime, because it can be changed into another prime (25577) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12789 + 12790.
It is an arithmetic number, because the mean of its divisors is an integer number (12790).
225579 is an apocalyptic number.
25579 is a deficient number, since it is larger than the sum of its proper divisors (1).
25579 is an equidigital number, since it uses as much as digits as its factorization.
25579 is an evil number, because the sum of its binary digits is even.
The product of its digits is 3150, while the sum is 28.
The square root of 25579 is about 159.9343615362.
The cubic root of 25579 is about 29.4641909656.
The spelling of 25579 in words is "twenty-five thousand, five hundred seventy-nine".