845991877 has 2 divisors, whose sum is σ = 845991878. Its totient is φ = 845991876.

The previous prime is 845991863. The next prime is 845991889. The reversal of 845991877 is 778199548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 825642756 + 20349121 = 28734^2 + 4511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845991877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (845991677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422995938 + 422995939.

It is an arithmetic number, because the mean of its divisors is an integer number (422995939).

Almost surely, 2^845991877 is an apocalyptic number.

It is an amenable number.

845991877 is a deficient number, since it is larger than the sum of its proper divisors (1).

845991877 is an equidigital number, since it uses as much as digits as its factorization.

845991877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 58.

The square root of 845991877 is about 29085.9395069164. The cubic root of 845991877 is about 945.7769622447.

The spelling of 845991877 in words is "eight hundred forty-five million, nine hundred ninety-one thousand, eight hundred seventy-seven".