811478812117 has 2 divisors, whose sum is σ = 811478812118. Its totient is φ = 811478812116.

The previous prime is 811478812091. The next prime is 811478812153. The reversal of 811478812117 is 711218874118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 430599752401 + 380879059716 = 656201^2 + 617154^2 .

It is a cyclic number.

It is not a de Polignac number, because 811478812117 - 2³¹ = 809331328469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811478812217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405739406058 + 405739406059.

It is an arithmetic number, because the mean of its divisors is an integer number (405739406059).

Almost surely, 2^811478812117 is an apocalyptic number.

It is an amenable number.

811478812117 is a deficient number, since it is larger than the sum of its proper divisors (1).

811478812117 is an equidigital number, since it uses as much as digits as its factorization.

811478812117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 200704, while the sum is 49.

The spelling of 811478812117 in words is "eight hundred eleven billion, four hundred seventy-eight million, eight hundred twelve thousand, one hundred seventeen".