26536561 has 2 divisors, whose sum is σ = 26536562. Its totient is φ = 26536560.

The previous prime is 26536513. The next prime is 26536577. The reversal of 26536561 is 16563562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26471025 + 65536 = 5145^2 + 256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26536561 is a prime.

It is not a weakly prime, because it can be changed into another prime (26536501) 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, 13268280 + 13268281.

It is an arithmetic number, because the mean of its divisors is an integer number (13268281).

Almost surely, 2^26536561 is an apocalyptic number.

It is an amenable number.

26536561 is a deficient number, since it is larger than the sum of its proper divisors (1).

26536561 is an equidigital number, since it uses as much as digits as its factorization.

26536561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 26536561 is about 5151.3649647448. The cubic root of 26536561 is about 298.2736439645.

It can be divided in two parts, 26536 and 561, that multiplied together give a triangular number (14886696 = T₅₄₅₆).

The spelling of 26536561 in words is "twenty-six million, five hundred thirty-six thousand, five hundred sixty-one".