813208081 has 8 divisors (see below), whose sum is σ = 930968640. Its totient is φ = 695844528.

The previous prime is 813208061. The next prime is 813208129. The reversal of 813208081 is 180802318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 813208081 - 2⁵ = 813208049 is a prime.

It is a super-2 number, since 2×813208081² = 1322614766007405122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (813208061) 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 7 ways as a sum of consecutive naturals, for example, 94846 + ... + 103063.

It is an arithmetic number, because the mean of its divisors is an integer number (116371080).

Almost surely, 2^813208081 is an apocalyptic number.

It is an amenable number.

813208081 is a deficient number, since it is larger than the sum of its proper divisors (117760559).

813208081 is a wasteful number, since it uses less digits than its factorization.

813208081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198503.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 813208081 is about 28516.8034849630. The cubic root of 813208081 is about 933.3987792402.

It can be divided in two parts, 81320 and 8081, that added together give a square (89401 = 299²).

The spelling of 813208081 in words is "eight hundred thirteen million, two hundred eight thousand, eighty-one".