26361581 has 2 divisors, whose sum is σ = 26361582. Its totient is φ = 26361580.

The previous prime is 26361557. The next prime is 26361631. The reversal of 26361581 is 18516362.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25664356 + 697225 = 5066^2 + 835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26361581 is a prime.

It is a super-2 number, since 2×26361581² = 1389865905639122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26361521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13180790 + 13180791.

It is an arithmetic number, because the mean of its divisors is an integer number (13180791).

Almost surely, 2^26361581 is an apocalyptic number.

It is an amenable number.

26361581 is a deficient number, since it is larger than the sum of its proper divisors (1).

26361581 is an equidigital number, since it uses as much as digits as its factorization.

26361581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 26361581 is about 5134.3530264289. The cubic root of 26361581 is about 297.6166000118.

The spelling of 26361581 in words is "twenty-six million, three hundred sixty-one thousand, five hundred eighty-one".