25609819 has 4 divisors (see below), whose sum is σ = 25651944. Its totient is φ = 25567696.

The previous prime is 25609799. The next prime is 25609847. The reversal of 25609819 is 91890652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25609819 - 2⁹ = 25609307 is a prime.

It is a super-2 number, since 2×25609819² = 1311725658425522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25609889) 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 in 3 ways as a sum of consecutive naturals, for example, 20137 + ... + 21370.

It is an arithmetic number, because the mean of its divisors is an integer number (6412986).

Almost surely, 2^25609819 is an apocalyptic number.

25609819 is a deficient number, since it is larger than the sum of its proper divisors (42125).

25609819 is an equidigital number, since it uses as much as digits as its factorization.

25609819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42124.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 25609819 is about 5060.6144883798. The cubic root of 25609819 is about 294.7601958094.

The spelling of 25609819 in words is "twenty-five million, six hundred nine thousand, eight hundred nineteen".