25819 has 2 divisors, whose sum is σ = 25820. Its totient is φ = 25818.

The previous prime is 25801. The next prime is 25841. The reversal of 25819 is 91852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25819 - 2⁹ = 25307 is a prime.

It is a super-2 number, since 2×25819² = 1333241522, which contains 22 as substring.

25819 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 25793 and 25802.

It is not a weakly prime, because it can be changed into another prime (25849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12909 + 12910.

It is an arithmetic number, because the mean of its divisors is an integer number (12910).

2²⁵⁸¹⁹ is an apocalyptic number.

25819 is a deficient number, since it is larger than the sum of its proper divisors (1).

25819 is an equidigital number, since it uses as much as digits as its factorization.

25819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 25.

The square root of 25819 is about 160.6829175737. The cubic root of 25819 is about 29.5560554393.

The spelling of 25819 in words is "twenty-five thousand, eight hundred nineteen".