812917893 has 4 divisors (see below), whose sum is σ = 1083890528. Its totient is φ = 541945260.

The previous prime is 812917877. The next prime is 812917913. The reversal of 812917893 is 398719218.

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 not a de Polignac number, because 812917893 - 2⁴ = 812917877 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 (812917813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135486313 + ... + 135486318.

It is an arithmetic number, because the mean of its divisors is an integer number (270972632).

Almost surely, 2^812917893 is an apocalyptic number.

It is an amenable number.

812917893 is a deficient number, since it is larger than the sum of its proper divisors (270972635).

812917893 is a wasteful number, since it uses less digits than its factorization.

812917893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270972634.

The product of its digits is 217728, while the sum is 48.

The square root of 812917893 is about 28511.7150133064. The cubic root of 812917893 is about 933.2877402757.

The spelling of 812917893 in words is "eight hundred twelve million, nine hundred seventeen thousand, eight hundred ninety-three".