809681552111 has 2 divisors, whose sum is σ = 809681552112. Its totient is φ = 809681552110.

The previous prime is 809681552041. The next prime is 809681552123. The reversal of 809681552111 is 111255186908.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809681552111 - 2²⁶ = 809614443247 is a prime.

It is a super-3 number, since 3×809681552111³ (a number of 37 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809681552611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404840776055 + 404840776056.

It is an arithmetic number, because the mean of its divisors is an integer number (404840776056).

Almost surely, 2^809681552111 is an apocalyptic number.

809681552111 is a deficient number, since it is larger than the sum of its proper divisors (1).

809681552111 is an equidigital number, since it uses as much as digits as its factorization.

809681552111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 47.

The spelling of 809681552111 in words is "eight hundred nine billion, six hundred eighty-one million, five hundred fifty-two thousand, one hundred eleven".