812656841 has 4 divisors (see below), whose sum is σ = 824102784. Its totient is φ = 801210900.

The previous prime is 812656813. The next prime is 812656843. The reversal of 812656841 is 148656218.

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, and also an emirpimes, since its reverse is a distinct semiprime: 148656218 = 2 ⋅74328109.

It is a cyclic number.

It is not a de Polignac number, because 812656841 - 2¹⁰ = 812655817 is a prime.

It is a super-2 number, since 2×812656841² = 1320822282448198562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812656843) 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, 5722865 + ... + 5723006.

It is an arithmetic number, because the mean of its divisors is an integer number (206025696).

Almost surely, 2^812656841 is an apocalyptic number.

It is an amenable number.

812656841 is a deficient number, since it is larger than the sum of its proper divisors (11445943).

812656841 is a wasteful number, since it uses less digits than its factorization.

812656841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11445942.

The product of its digits is 92160, while the sum is 41.

The square root of 812656841 is about 28507.1366678592. The cubic root of 812656841 is about 933.1878274728.

The spelling of 812656841 in words is "eight hundred twelve million, six hundred fifty-six thousand, eight hundred forty-one".