26109391 has 16 divisors (see below), whose sum is σ = 32866560. Its totient is φ = 20148480.

The previous prime is 26109389. The next prime is 26109449. The reversal of 26109391 is 19390162.

It is not a de Polignac number, because 26109391 - 2¹ = 26109389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26109311) 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, 6655 + ... + 9823.

It is an arithmetic number, because the mean of its divisors is an integer number (2054160).

Almost surely, 2^26109391 is an apocalyptic number.

26109391 is a deficient number, since it is larger than the sum of its proper divisors (6757169).

26109391 is a wasteful number, since it uses less digits than its factorization.

26109391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3294.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 26109391 is about 5109.7349246316. The cubic root of 26109391 is about 296.6645003980.

The spelling of 26109391 in words is "twenty-six million, one hundred nine thousand, three hundred ninety-one".