26581009 has 16 divisors (see below), whose sum is σ = 33480832. Its totient is φ = 20539008.

The previous prime is 26581003. The next prime is 26581039. The reversal of 26581009 is 90018562.

It is not a de Polignac number, because 26581009 - 2³ = 26581001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26581001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 517 + ... + 7309.

It is an arithmetic number, because the mean of its divisors is an integer number (2092552).

Almost surely, 2^26581009 is an apocalyptic number.

It is an amenable number.

26581009 is a deficient number, since it is larger than the sum of its proper divisors (6899823).

26581009 is a wasteful number, since it uses less digits than its factorization.

26581009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6856.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 26581009 is about 5155.6773560804. The cubic root of 26581009 is about 298.4400844179.

The spelling of 26581009 in words is "twenty-six million, five hundred eighty-one thousand, nine".