26561543 has 4 divisors (see below), whose sum is σ = 26572080. Its totient is φ = 26551008.

The previous prime is 26561539. The next prime is 26561551. The reversal of 26561543 is 34516562.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 26561543 - 2² = 26561539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26561503) 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 in 3 ways as a sum of consecutive naturals, for example, 998 + ... + 7356.

It is an arithmetic number, because the mean of its divisors is an integer number (6643020).

Almost surely, 2^26561543 is an apocalyptic number.

26561543 is a deficient number, since it is larger than the sum of its proper divisors (10537).

26561543 is an equidigital number, since it uses as much as digits as its factorization.

26561543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10536.

The product of its digits is 21600, while the sum is 32.

The square root of 26561543 is about 5153.7891885486. The cubic root of 26561543 is about 298.3672146810.

The spelling of 26561543 in words is "twenty-six million, five hundred sixty-one thousand, five hundred forty-three".