811550011 has 2 divisors, whose sum is σ = 811550012. Its totient is φ = 811550010.

The previous prime is 811549993. The next prime is 811550071. The reversal of 811550011 is 110055118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 811550011 - 2⁹ = 811549499 is a prime.

It is a super-2 number, since 2×811550011² = 1317226840708200242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (811550071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405775005 + 405775006.

It is an arithmetic number, because the mean of its divisors is an integer number (405775006).

Almost surely, 2^811550011 is an apocalyptic number.

811550011 is a deficient number, since it is larger than the sum of its proper divisors (1).

811550011 is an equidigital number, since it uses as much as digits as its factorization.

811550011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 22.

The square root of 811550011 is about 28487.7168442822. The cubic root of 811550011 is about 932.7639710101.

The spelling of 811550011 in words is "eight hundred eleven million, five hundred fifty thousand, eleven".