811314191 has 4 divisors (see below), whose sum is σ = 831102384. Its totient is φ = 791526000.

The previous prime is 811314181. The next prime is 811314197. The reversal of 811314191 is 191413118.

811314191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811314191 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 (811314197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9894035 + ... + 9894116.

It is an arithmetic number, because the mean of its divisors is an integer number (207775596).

Almost surely, 2^811314191 is an apocalyptic number.

811314191 is a deficient number, since it is larger than the sum of its proper divisors (19788193).

811314191 is a wasteful number, since it uses less digits than its factorization.

811314191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19788192.

The product of its digits is 864, while the sum is 29.

The square root of 811314191 is about 28483.5775667313. The cubic root of 811314191 is about 932.6736148168.

The spelling of 811314191 in words is "eight hundred eleven million, three hundred fourteen thousand, one hundred ninety-one".