26561251 has 8 divisors (see below), whose sum is σ = 28306944. Its totient is φ = 24864840.

The previous prime is 26561243. The next prime is 26561261. The reversal of 26561251 is 15216562.

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

It is not a de Polignac number, because 26561251 - 2³ = 26561243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26561201) 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 in 7 ways as a sum of consecutive naturals, for example, 11205 + ... + 13366.

It is an arithmetic number, because the mean of its divisors is an integer number (3538368).

Almost surely, 2^26561251 is an apocalyptic number.

26561251 is a deficient number, since it is larger than the sum of its proper divisors (1745693).

26561251 is a wasteful number, since it uses less digits than its factorization.

26561251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24641.

The product of its digits is 3600, while the sum is 28.

The square root of 26561251 is about 5153.7608597994. The cubic root of 26561251 is about 298.3661213266.

It can be divided in two parts, 265 and 61251, that added together give a palindrome (61516).

The spelling of 26561251 in words is "twenty-six million, five hundred sixty-one thousand, two hundred fifty-one".