25871819 has 2 divisors, whose sum is σ = 25871820. Its totient is φ = 25871818.

The previous prime is 25871771. The next prime is 25871821. The reversal of 25871819 is 91817852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25871819 - 2²⁰ = 24823243 is a prime.

It is a super-2 number, since 2×25871819² = 1338702036737522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 25871821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25871899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12935909 + 12935910.

It is an arithmetic number, because the mean of its divisors is an integer number (12935910).

Almost surely, 2^25871819 is an apocalyptic number.

25871819 is a deficient number, since it is larger than the sum of its proper divisors (1).

25871819 is an equidigital number, since it uses as much as digits as its factorization.

25871819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 41.

The square root of 25871819 is about 5086.4348024918. The cubic root of 25871819 is about 295.7619639426.

The spelling of 25871819 in words is "twenty-five million, eight hundred seventy-one thousand, eight hundred nineteen".