811355816 has 8 divisors (see below), whose sum is σ = 1521292170. Its totient is φ = 405677904.

The previous prime is 811355791. The next prime is 811355861. The reversal of 811355816 is 618553118.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 798062500 + 13293316 = 28250^2 + 3646^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 811355816.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50709731 + ... + 50709746.

Almost surely, 2^811355816 is an apocalyptic number.

It is an amenable number.

811355816 is a deficient number, since it is larger than the sum of its proper divisors (709936354).

811355816 is a wasteful number, since it uses less digits than its factorization.

811355816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101419483 (or 101419479 counting only the distinct ones).

The product of its digits is 28800, while the sum is 38.

The square root of 811355816 is about 28484.3082415564. The cubic root of 811355816 is about 932.6895650187.

The spelling of 811355816 in words is "eight hundred eleven million, three hundred fifty-five thousand, eight hundred sixteen".