26561131 has 2 divisors, whose sum is σ = 26561132. Its totient is φ = 26561130.

The previous prime is 26561111. The next prime is 26561137. The reversal of 26561131 is 13116562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26561131 - 2⁵ = 26561099 is a prime.

It is a super-2 number, since 2×26561131² = 1410987359998322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26561096 and 26561105.

It is not a weakly prime, because it can be changed into another prime (26561137) 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, 13280565 + 13280566.

It is an arithmetic number, because the mean of its divisors is an integer number (13280566).

Almost surely, 2^26561131 is an apocalyptic number.

26561131 is a deficient number, since it is larger than the sum of its proper divisors (1).

26561131 is an equidigital number, since it uses as much as digits as its factorization.

26561131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 26561131 is about 5153.7492178025. The cubic root of 26561131 is about 298.3656720005.

Adding to 26561131 its reverse (13116562), we get a palindrome (39677693).

The spelling of 26561131 in words is "twenty-six million, five hundred sixty-one thousand, one hundred thirty-one".