26091609 has 16 divisors (see below), whose sum is σ = 35512320. Its totient is φ = 17035920.

The previous prime is 26091601. The next prime is 26091613. The reversal of 26091609 is 90619062.

It is a happy number.

It is not a de Polignac number, because 26091609 - 2³ = 26091601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26091609.

It is not an unprimeable number, because it can be changed into a prime (26091601) 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, 54232 + ... + 54710.

It is an arithmetic number, because the mean of its divisors is an integer number (2219520).

Almost surely, 2^26091609 is an apocalyptic number.

It is an amenable number.

26091609 is a deficient number, since it is larger than the sum of its proper divisors (9420711).

26091609 is a wasteful number, since it uses less digits than its factorization.

26091609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 26091609 is about 5107.9946162853. The cubic root of 26091609 is about 296.5971365621.

The spelling of 26091609 in words is "twenty-six million, ninety-one thousand, six hundred nine".