812369547681 has 4 divisors (see below), whose sum is σ = 1083159396912. Its totient is φ = 541579698452.

The previous prime is 812369547617. The next prime is 812369547701. The reversal of 812369547681 is 186745963218.

It is a happy number.

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 812369547681 - 2⁶ = 812369547617 is a prime.

It is a super-2 number, since 2×812369547681² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (812369547481) 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, 135394924611 + ... + 135394924616.

It is an arithmetic number, because the mean of its divisors is an integer number (270789849228).

Almost surely, 2^812369547681 is an apocalyptic number.

It is an amenable number.

812369547681 is a deficient number, since it is larger than the sum of its proper divisors (270789849231).

812369547681 is a wasteful number, since it uses less digits than its factorization.

812369547681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270789849230.

The product of its digits is 17418240, while the sum is 60.

The spelling of 812369547681 in words is "eight hundred twelve billion, three hundred sixty-nine million, five hundred forty-seven thousand, six hundred eighty-one".