811312133 has 4 divisors (see below), whose sum is σ = 814950528. Its totient is φ = 807673740.

The previous prime is 811312123. The next prime is 811312147. The reversal of 811312133 is 331213118.

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 811312133 - 2⁸ = 811311877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 811312099 and 811312108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811312123) 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, 1818863 + ... + 1819308.

It is an arithmetic number, because the mean of its divisors is an integer number (203737632).

Almost surely, 2^811312133 is an apocalyptic number.

It is an amenable number.

811312133 is a deficient number, since it is larger than the sum of its proper divisors (3638395).

811312133 is a wasteful number, since it uses less digits than its factorization.

811312133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638394.

The product of its digits is 432, while the sum is 23.

The square root of 811312133 is about 28483.5414406285. The cubic root of 811312133 is about 932.6728262017.

The spelling of 811312133 in words is "eight hundred eleven million, three hundred twelve thousand, one hundred thirty-three".