811081811 has 2 divisors, whose sum is σ = 811081812. Its totient is φ = 811081810.

The previous prime is 811081801. The next prime is 811081841. The reversal of 811081811 is 118180118.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811081811 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (811081801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405540905 + 405540906.

It is an arithmetic number, because the mean of its divisors is an integer number (405540906).

Almost surely, 2^811081811 is an apocalyptic number.

811081811 is a deficient number, since it is larger than the sum of its proper divisors (1).

811081811 is an equidigital number, since it uses as much as digits as its factorization.

811081811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 29.

The square root of 811081811 is about 28479.4980819536. The cubic root of 811081811 is about 932.5845595560.

The spelling of 811081811 in words is "eight hundred eleven million, eighty-one thousand, eight hundred eleven".