25509823 has 2 divisors, whose sum is σ = 25509824. Its totient is φ = 25509822.

The previous prime is 25509797. The next prime is 25509853. The reversal of 25509823 is 32890552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25509823 - 2⁵ = 25509791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25509853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12754911 + 12754912.

It is an arithmetic number, because the mean of its divisors is an integer number (12754912).

Almost surely, 2^25509823 is an apocalyptic number.

25509823 is a deficient number, since it is larger than the sum of its proper divisors (1).

25509823 is an equidigital number, since it uses as much as digits as its factorization.

25509823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 25509823 is about 5050.7249974632. The cubic root of 25509823 is about 294.3760555645.

The spelling of 25509823 in words is "twenty-five million, five hundred nine thousand, eight hundred twenty-three".