26491609 has 3 divisors (see below), whose sum is σ = 26496757. Its totient is φ = 26486462.

The previous prime is 26491603. The next prime is 26491613. The reversal of 26491609 is 90619462.

The square root of 26491609 is 5147.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 26491609 - 2³ = 26491601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26491601) 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 2 ways as a sum of consecutive naturals, for example, 2574 + ... + 7720.

Almost surely, 2^26491609 is an apocalyptic number.

26491609 is the 5147-th square number.

26491609 is the 2574-th centered octagonal number.

It is an amenable number.

26491609 is a deficient number, since it is larger than the sum of its proper divisors (5148).

26491609 is an frugal number, since it uses more digits than its factorization.

26491609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10294 (or 5147 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The cubic root of 26491609 is about 298.1051270912.

The spelling of 26491609 in words is "twenty-six million, four hundred ninety-one thousand, six hundred nine".