25434809 has 2 divisors, whose sum is σ = 25434810. Its totient is φ = 25434808.

The previous prime is 25434797. The next prime is 25434811. The reversal of 25434809 is 90843452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24720784 + 714025 = 4972^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 25434809 - 2⁸ = 25434553 is a prime.

Together with 25434811, 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 (25434109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12717404 + 12717405.

It is an arithmetic number, because the mean of its divisors is an integer number (12717405).

Almost surely, 2^25434809 is an apocalyptic number.

It is an amenable number.

25434809 is a deficient number, since it is larger than the sum of its proper divisors (1).

25434809 is an equidigital number, since it uses as much as digits as its factorization.

25434809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 25434809 is about 5043.2934675666. The cubic root of 25434809 is about 294.0872255727.

The spelling of 25434809 in words is "twenty-five million, four hundred thirty-four thousand, eight hundred nine".