812963871 has 30 divisors (see below), whose sum is σ = 1255809632. Its totient is φ = 523571040.

The previous prime is 812963857. The next prime is 812963909. The reversal of 812963871 is 178369218.

812963871 is a `hidden beast` number, since 8 + 1 + 2 + 9 + 638 + 7 + 1 = 666.

812963871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 812963871 - 2⁵ = 812963839 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 (812963821) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1428475 + ... + 1429043.

Almost surely, 2^812963871 is an apocalyptic number.

812963871 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

812963871 is a deficient number, since it is larger than the sum of its proper divisors (442845761).

812963871 is an frugal number, since it uses more digits than its factorization.

812963871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181 (or 603 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 812963871 is about 28512.5213020525. The cubic root of 812963871 is about 933.3053352854.

The spelling of 812963871 in words is "eight hundred twelve million, nine hundred sixty-three thousand, eight hundred seventy-one".