811050891913 has 2 divisors, whose sum is σ = 811050891914. Its totient is φ = 811050891912.

The previous prime is 811050891883. The next prime is 811050891953. The reversal of 811050891913 is 319198050118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 440933184784 + 370117707129 = 664028^2 + 608373^2 .

It is a cyclic number.

It is not a de Polignac number, because 811050891913 - 2⁹ = 811050891401 is a prime.

It is not a weakly prime, because it can be changed into another prime (811050891953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405525445956 + 405525445957.

It is an arithmetic number, because the mean of its divisors is an integer number (405525445957).

Almost surely, 2^811050891913 is an apocalyptic number.

It is an amenable number.

811050891913 is a deficient number, since it is larger than the sum of its proper divisors (1).

811050891913 is an equidigital number, since it uses as much as digits as its factorization.

811050891913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 46.

The spelling of 811050891913 in words is "eight hundred eleven billion, fifty million, eight hundred ninety-one thousand, nine hundred thirteen".