812928491 has 32 divisors (see below), whose sum is σ = 923788800. Its totient is φ = 711293440.

The previous prime is 812928461. The next prime is 812928503. The reversal of 812928491 is 194829218.

It is a cyclic number.

It is not a de Polignac number, because 812928491 - 2²² = 808734187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812928401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3021905 + ... + 3022173.

It is an arithmetic number, because the mean of its divisors is an integer number (28868400).

Almost surely, 2^812928491 is an apocalyptic number.

812928491 is a deficient number, since it is larger than the sum of its proper divisors (110860309).

812928491 is a wasteful number, since it uses less digits than its factorization.

812928491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499.

The product of its digits is 82944, while the sum is 44.

The square root of 812928491 is about 28511.9008661296. The cubic root of 812928491 is about 933.2917960114.

The spelling of 812928491 in words is "eight hundred twelve million, nine hundred twenty-eight thousand, four hundred ninety-one".