812235521287 has 4 divisors (see below), whose sum is σ = 812237906200. Its totient is φ = 812233136376.

The previous prime is 812235521261. The next prime is 812235521303. The reversal of 812235521287 is 782125532218.

812235521287 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 not a de Polignac number, because 812235521287 - 2⁷ = 812235521159 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 (812235521387) 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, 575037 + ... + 1398262.

It is an arithmetic number, because the mean of its divisors is an integer number (203059476550).

Almost surely, 2^812235521287 is an apocalyptic number.

812235521287 is a deficient number, since it is larger than the sum of its proper divisors (2384913).

812235521287 is a wasteful number, since it uses less digits than its factorization.

812235521287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384912.

The product of its digits is 537600, while the sum is 46.

The spelling of 812235521287 in words is "eight hundred twelve billion, two hundred thirty-five million, five hundred twenty-one thousand, two hundred eighty-seven".