26051561 has 2 divisors, whose sum is σ = 26051562. Its totient is φ = 26051560.

The previous prime is 26051549. The next prime is 26051579. The reversal of 26051561 is 16515062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25755625 + 295936 = 5075^2 + 544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26051561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26051561.

It is not a weakly prime, because it can be changed into another prime (26051521) 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, 13025780 + 13025781.

It is an arithmetic number, because the mean of its divisors is an integer number (13025781).

Almost surely, 2^26051561 is an apocalyptic number.

It is an amenable number.

26051561 is a deficient number, since it is larger than the sum of its proper divisors (1).

26051561 is an equidigital number, since it uses as much as digits as its factorization.

26051561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 26051561 is about 5104.0729814531. The cubic root of 26051561 is about 296.4453099148.

The spelling of 26051561 in words is "twenty-six million, fifty-one thousand, five hundred sixty-one".