26317891 has 2 divisors, whose sum is σ = 26317892. Its totient is φ = 26317890.

The previous prime is 26317867. The next prime is 26317897. The reversal of 26317891 is 19871362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26317891 - 2²³ = 17929283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26317891.

It is not a weakly prime, because it can be changed into another prime (26317897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13158945 + 13158946.

It is an arithmetic number, because the mean of its divisors is an integer number (13158946).

Almost surely, 2^26317891 is an apocalyptic number.

26317891 is a deficient number, since it is larger than the sum of its proper divisors (1).

26317891 is an equidigital number, since it uses as much as digits as its factorization.

26317891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 26317891 is about 5130.0965877847. The cubic root of 26317891 is about 297.4520921844.

The spelling of 26317891 in words is "twenty-six million, three hundred seventeen thousand, eight hundred ninety-one".