26261561 has 8 divisors (see below), whose sum is σ = 27475200. Its totient is φ = 25053952.

The previous prime is 26261513. The next prime is 26261567. The reversal of 26261561 is 16516262.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26261561 - 2¹⁰ = 26260537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26261567) 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 7 ways as a sum of consecutive naturals, for example, 9056 + ... + 11598.

It is an arithmetic number, because the mean of its divisors is an integer number (3434400).

Almost surely, 2^26261561 is an apocalyptic number.

It is an amenable number.

26261561 is a deficient number, since it is larger than the sum of its proper divisors (1213639).

26261561 is a wasteful number, since it uses less digits than its factorization.

26261561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015.

The product of its digits is 4320, while the sum is 29.

The square root of 26261561 is about 5124.6034968571. The cubic root of 26261561 is about 297.2397215086.

The spelling of 26261561 in words is "twenty-six million, two hundred sixty-one thousand, five hundred sixty-one".