26831395089409 has 3 divisors (see below), whose sum is σ = 26831400269313. Its totient is φ = 26831389909506.

The previous prime is 26831395089403. The next prime is 26831395089413. The reversal of 26831395089409 is 90498059313862.

The square root of 26831395089409 is 5179903.

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 a de Polignac number, because none of the positive numbers 2^k-26831395089409 is a prime.

It is a super-3 number, since 3×26831395089409³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26831395089403) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2589952 + ... + 7769854.

It is an arithmetic number, because the mean of its divisors is an integer number (8943800089771).

Almost surely, 2^{26831395089409} is an apocalyptic number.

26831395089409 is the 5179903-rd square number.

26831395089409 is the 2589952-nd centered octagonal number.

It is an amenable number.

26831395089409 is a deficient number, since it is larger than the sum of its proper divisors (5179904).

26831395089409 is an frugal number, since it uses more digits than its factorization.

26831395089409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10359806 (or 5179903 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 67.

The spelling of 26831395089409 in words is "twenty-six trillion, eight hundred thirty-one billion, three hundred ninety-five million, eighty-nine thousand, four hundred nine".