813281109 has 4 divisors (see below), whose sum is σ = 1084374816. Its totient is φ = 542187404.

The previous prime is 813281093. The next prime is 813281123. The reversal of 813281109 is 901182318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 813281109 - 2⁴ = 813281093 is a prime.

It is a super-3 number, since 3×813281109³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 813281109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813281129) 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, 135546849 + ... + 135546854.

It is an arithmetic number, because the mean of its divisors is an integer number (271093704).

Almost surely, 2^813281109 is an apocalyptic number.

It is an amenable number.

813281109 is a deficient number, since it is larger than the sum of its proper divisors (271093707).

813281109 is a wasteful number, since it uses less digits than its factorization.

813281109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271093706.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 813281109 is about 28518.0838942591. The cubic root of 813281109 is about 933.4267188730.

The spelling of 813281109 in words is "eight hundred thirteen million, two hundred eighty-one thousand, one hundred nine".