845556911 has 2 divisors, whose sum is σ = 845556912. Its totient is φ = 845556910.

The previous prime is 845556869. The next prime is 845556913. The reversal of 845556911 is 119655548.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845556911 is a prime.

Together with 845556913, 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 (845556913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422778455 + 422778456.

It is an arithmetic number, because the mean of its divisors is an integer number (422778456).

Almost surely, 2^845556911 is an apocalyptic number.

845556911 is a deficient number, since it is larger than the sum of its proper divisors (1).

845556911 is an equidigital number, since it uses as much as digits as its factorization.

845556911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 44.

The square root of 845556911 is about 29078.4612901027. The cubic root of 845556911 is about 945.6148443185.

The spelling of 845556911 in words is "eight hundred forty-five million, five hundred fifty-six thousand, nine hundred eleven".