811262861 has 2 divisors, whose sum is σ = 811262862. Its totient is φ = 811262860.

The previous prime is 811262807. The next prime is 811262863. The reversal of 811262861 is 168262118.

811262861 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., 804856900 + 6405961 = 28370^2 + 2531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811262861 is a prime.

Together with 811262863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811262863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405631430 + 405631431.

It is an arithmetic number, because the mean of its divisors is an integer number (405631431).

Almost surely, 2^811262861 is an apocalyptic number.

It is an amenable number.

811262861 is a deficient number, since it is larger than the sum of its proper divisors (1).

811262861 is an equidigital number, since it uses as much as digits as its factorization.

811262861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 35.

The square root of 811262861 is about 28482.6765069577. The cubic root of 811262861 is about 932.6539450240.

The spelling of 811262861 in words is "eight hundred eleven million, two hundred sixty-two thousand, eight hundred sixty-one".