26456561 has 2 divisors, whose sum is σ = 26456562. Its totient is φ = 26456560.

The previous prime is 26456537. The next prime is 26456597. The reversal of 26456561 is 16565462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25816561 + 640000 = 5081^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 26456561 - 2²² = 22262257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26456501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13228280 + 13228281.

It is an arithmetic number, because the mean of its divisors is an integer number (13228281).

Almost surely, 2^26456561 is an apocalyptic number.

It is an amenable number.

26456561 is a deficient number, since it is larger than the sum of its proper divisors (1).

26456561 is an equidigital number, since it uses as much as digits as its factorization.

26456561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 26456561 is about 5143.5941713942. The cubic root of 26456561 is about 297.9736062085.

The spelling of 26456561 in words is "twenty-six million, four hundred fifty-six thousand, five hundred sixty-one".