813520855 has 8 divisors (see below), whose sum is σ = 1115685792. Its totient is φ = 557842848.

The previous prime is 813520849. The next prime is 813520871. The reversal of 813520855 is 558025318.

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 813520855 - 2⁵ = 813520823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11621692 + ... + 11621761.

It is an arithmetic number, because the mean of its divisors is an integer number (139460724).

Almost surely, 2^813520855 is an apocalyptic number.

813520855 is a deficient number, since it is larger than the sum of its proper divisors (302164937).

813520855 is a wasteful number, since it uses less digits than its factorization.

813520855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23243465.

The product of its (nonzero) digits is 48000, while the sum is 37.

The square root of 813520855 is about 28522.2869875471. The cubic root of 813520855 is about 933.5184310471.

The spelling of 813520855 in words is "eight hundred thirteen million, five hundred twenty thousand, eight hundred fifty-five".