26561501 has 2 divisors, whose sum is σ = 26561502. Its totient is φ = 26561500.

The previous prime is 26561473. The next prime is 26561503. The reversal of 26561501 is 10516562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23755876 + 2805625 = 4874^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 26561501 - 2²² = 22367197 is a prime.

Together with 26561503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26561503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13280750 + 13280751.

It is an arithmetic number, because the mean of its divisors is an integer number (13280751).

Almost surely, 2^26561501 is an apocalyptic number.

It is an amenable number.

26561501 is a deficient number, since it is larger than the sum of its proper divisors (1).

26561501 is an equidigital number, since it uses as much as digits as its factorization.

26561501 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 26561501 is about 5153.7851138750. The cubic root of 26561501 is about 298.3670574182.

The spelling of 26561501 in words is "twenty-six million, five hundred sixty-one thousand, five hundred one".