845281117 has 2 divisors, whose sum is σ = 845281118. Its totient is φ = 845281116.

The previous prime is 845281103. The next prime is 845281127. The reversal of 845281117 is 711182548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 807753241 + 37527876 = 28421^2 + 6126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845281117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (845281127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422640558 + 422640559.

It is an arithmetic number, because the mean of its divisors is an integer number (422640559).

Almost surely, 2^845281117 is an apocalyptic number.

It is an amenable number.

845281117 is a deficient number, since it is larger than the sum of its proper divisors (1).

845281117 is an equidigital number, since it uses as much as digits as its factorization.

845281117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17920, while the sum is 37.

The square root of 845281117 is about 29073.7186648010. The cubic root of 845281117 is about 945.5120232245.

The spelling of 845281117 in words is "eight hundred forty-five million, two hundred eighty-one thousand, one hundred seventeen".