811031604013 has 4 divisors (see below), whose sum is σ = 813014566780. Its totient is φ = 809048641248.

The previous prime is 811031603983. The next prime is 811031604041. The reversal of 811031604013 is 310406130118.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 661167386884 + 149864217129 = 813122^2 + 387123^2 .

It is a cyclic number.

It is not a de Polignac number, because 811031604013 - 2¹⁷ = 811031472941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811031604083) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 991480770 + ... + 991481587.

It is an arithmetic number, because the mean of its divisors is an integer number (203253641695).

Almost surely, 2^811031604013 is an apocalyptic number.

It is an amenable number.

811031604013 is a deficient number, since it is larger than the sum of its proper divisors (1982962767).

811031604013 is a wasteful number, since it uses less digits than its factorization.

811031604013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982962766.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 811031604013 in words is "eight hundred eleven billion, thirty-one million, six hundred four thousand, thirteen".