811125817 has 2 divisors, whose sum is σ = 811125818. Its totient is φ = 811125816.

The previous prime is 811125787. The next prime is 811125823. The reversal of 811125817 is 718521118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 705221136 + 105904681 = 26556^2 + 10291^2 .

It is a cyclic number.

It is not a de Polignac number, because 811125817 - 2²³ = 802737209 is a prime.

It is not a weakly prime, because it can be changed into another prime (811125857) by changing a digit.

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, 405562908 + 405562909.

It is an arithmetic number, because the mean of its divisors is an integer number (405562909).

Almost surely, 2^811125817 is an apocalyptic number.

It is an amenable number.

811125817 is a deficient number, since it is larger than the sum of its proper divisors (1).

811125817 is an equidigital number, since it uses as much as digits as its factorization.

811125817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 34.

The square root of 811125817 is about 28480.2706623375. The cubic root of 811125817 is about 932.6014253327.

The spelling of 811125817 in words is "eight hundred eleven million, one hundred twenty-five thousand, eight hundred seventeen".