25534543 has 2 divisors, whose sum is σ = 25534544. Its totient is φ = 25534542.

The previous prime is 25534541. The next prime is 25534547. The reversal of 25534543 is 34543552.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25534543 - 2¹ = 25534541 is a prime.

Together with 25534541, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25534541) 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, 12767271 + 12767272.

It is an arithmetic number, because the mean of its divisors is an integer number (12767272).

Almost surely, 2^25534543 is an apocalyptic number.

25534543 is a deficient number, since it is larger than the sum of its proper divisors (1).

25534543 is an equidigital number, since it uses as much as digits as its factorization.

25534543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36000, while the sum is 31.

The square root of 25534543 is about 5053.1715783258. The cubic root of 25534543 is about 294.4711121081.

Subtracting 25534543 from its reverse (34543552), we obtain a palindrome (9009009).

The spelling of 25534543 in words is "twenty-five million, five hundred thirty-four thousand, five hundred forty-three".