812303991 has 32 divisors (see below), whose sum is σ = 1224704000. Its totient is φ = 532026144.

The previous prime is 812303983. The next prime is 812303993. The reversal of 812303991 is 199303218.

It is not a de Polignac number, because 812303991 - 2³ = 812303983 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 (812303993) 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, 487626 + ... + 489288.

It is an arithmetic number, because the mean of its divisors is an integer number (38272000).

Almost surely, 2^812303991 is an apocalyptic number.

812303991 is a deficient number, since it is larger than the sum of its proper divisors (412400009).

812303991 is a wasteful number, since it uses less digits than its factorization.

812303991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980 (or 1974 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 812303991 is about 28500.9471947864. The cubic root of 812303991 is about 933.0527466793.

The spelling of 812303991 in words is "eight hundred twelve million, three hundred three thousand, nine hundred ninety-one".