26102561 has 4 divisors (see below), whose sum is σ = 27476400. Its totient is φ = 24728724.

The previous prime is 26102521. The next prime is 26102563. The reversal of 26102561 is 16520162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26102561 - 2¹⁸ = 25840417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26102563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686891 + ... + 686928.

It is an arithmetic number, because the mean of its divisors is an integer number (6869100).

Almost surely, 2^26102561 is an apocalyptic number.

It is an amenable number.

26102561 is a deficient number, since it is larger than the sum of its proper divisors (1373839).

26102561 is a wasteful number, since it uses less digits than its factorization.

26102561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373838.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 26102561 is about 5109.0665487934. The cubic root of 26102561 is about 296.6386298183.

The spelling of 26102561 in words is "twenty-six million, one hundred two thousand, five hundred sixty-one".