26791131491 has 4 divisors (see below), whose sum is σ = 27296624592. Its totient is φ = 26285638392.

The previous prime is 26791131463. The next prime is 26791131527. The reversal of 26791131491 is 19413119762.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26791131491 - 2³⁰ = 25717389667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26791131401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252746471 + ... + 252746576.

It is an arithmetic number, because the mean of its divisors is an integer number (6824156148).

Almost surely, 2^26791131491 is an apocalyptic number.

26791131491 is a deficient number, since it is larger than the sum of its proper divisors (505493101).

26791131491 is an equidigital number, since it uses as much as digits as its factorization.

26791131491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505493100.

The product of its digits is 81648, while the sum is 44.

The spelling of 26791131491 in words is "twenty-six billion, seven hundred ninety-one million, one hundred thirty-one thousand, four hundred ninety-one".