811538857 has 2 divisors, whose sum is σ = 811538858. Its totient is φ = 811538856.

The previous prime is 811538839. The next prime is 811538867. The reversal of 811538857 is 758835118.

It is a happy number.

811538857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654387561 + 157151296 = 25581^2 + 12536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811538857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (811538807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405769428 + 405769429.

It is an arithmetic number, because the mean of its divisors is an integer number (405769429).

Almost surely, 2^811538857 is an apocalyptic number.

It is an amenable number.

811538857 is a deficient number, since it is larger than the sum of its proper divisors (1).

811538857 is an equidigital number, since it uses as much as digits as its factorization.

811538857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 268800, while the sum is 46.

The square root of 811538857 is about 28487.5210750251. The cubic root of 811538857 is about 932.7596976661.

The spelling of 811538857 in words is "eight hundred eleven million, five hundred thirty-eight thousand, eight hundred fifty-seven".