845921317 has 2 divisors, whose sum is σ = 845921318. Its totient is φ = 845921316.

The previous prime is 845921311. The next prime is 845921407. The reversal of 845921317 is 713129548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 471150436 + 374770881 = 21706^2 + 19359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845921317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 845921317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (845921311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422960658 + 422960659.

It is an arithmetic number, because the mean of its divisors is an integer number (422960659).

Almost surely, 2^845921317 is an apocalyptic number.

It is an amenable number.

845921317 is a deficient number, since it is larger than the sum of its proper divisors (1).

845921317 is an equidigital number, since it uses as much as digits as its factorization.

845921317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 845921317 is about 29084.7265244148. The cubic root of 845921317 is about 945.7506673200.

The spelling of 845921317 in words is "eight hundred forty-five million, nine hundred twenty-one thousand, three hundred seventeen".