813391112 has 32 divisors (see below), whose sum is σ = 1636961400. Its totient is φ = 377524224.

The previous prime is 813391109. The next prime is 813391157. The reversal of 813391112 is 211193318.

It can be written as a sum of positive squares in 4 ways, for example, as 711502276 + 101888836 = 26674^2 + 10094^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31037 + ... + 50892.

Almost surely, 2^813391112 is an apocalyptic number.

It is an amenable number.

813391112 is an abundant number, since it is smaller than the sum of its proper divisors (823570288).

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

813391112 is a wasteful number, since it uses less digits than its factorization.

813391112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82025 (or 82021 counting only the distinct ones).

The product of its digits is 1296, while the sum is 29.

The square root of 813391112 is about 28520.0124824657. The cubic root of 813391112 is about 933.4688015384.

The spelling of 813391112 in words is "eight hundred thirteen million, three hundred ninety-one thousand, one hundred twelve".