812161336 has 16 divisors (see below), whose sum is σ = 1740345840. Its totient is φ = 348069120.

The previous prime is 812161319. The next prime is 812161367. The reversal of 812161336 is 633161218.

It is a junction number, because it is equal to n+sod(n) for n = 812161298 and 812161307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7251385 + ... + 7251496.

It is an arithmetic number, because the mean of its divisors is an integer number (108771615).

Almost surely, 2^812161336 is an apocalyptic number.

It is an amenable number.

812161336 is an abundant number, since it is smaller than the sum of its proper divisors (928184504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812161336 is a wasteful number, since it uses less digits than its factorization.

812161336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14502894 (or 14502890 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 812161336 is about 28498.4444487765. Note that the first 5 decimals coincide. The cubic root of 812161336 is about 932.9981232733.

The spelling of 812161336 in words is "eight hundred twelve million, one hundred sixty-one thousand, three hundred thirty-six".