25543799 has 2 divisors, whose sum is σ = 25543800. Its totient is φ = 25543798.

The previous prime is 25543769. The next prime is 25543807. The reversal of 25543799 is 99734552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25543799 - 2¹⁶ = 25478263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25543709) 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, 12771899 + 12771900.

It is an arithmetic number, because the mean of its divisors is an integer number (12771900).

Almost surely, 2^25543799 is an apocalyptic number.

25543799 is a deficient number, since it is larger than the sum of its proper divisors (1).

25543799 is an equidigital number, since it uses as much as digits as its factorization.

25543799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 44.

The square root of 25543799 is about 5054.0873557943. The cubic root of 25543799 is about 294.5066886908.

The spelling of 25543799 in words is "twenty-five million, five hundred forty-three thousand, seven hundred ninety-nine".