845820617 has 2 divisors, whose sum is σ = 845820618. Its totient is φ = 845820616.

The previous prime is 845820557. The next prime is 845820631. The reversal of 845820617 is 716028548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 569729161 + 276091456 = 23869^2 + 16616^2 .

It is a cyclic number.

It is not a de Polignac number, because 845820617 - 2²⁴ = 829043401 is a prime.

It is a super-2 number, since 2×845820617² = 1430825032284521378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (845820517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422910308 + 422910309.

It is an arithmetic number, because the mean of its divisors is an integer number (422910309).

Almost surely, 2^845820617 is an apocalyptic number.

It is an amenable number.

845820617 is a deficient number, since it is larger than the sum of its proper divisors (1).

845820617 is an equidigital number, since it uses as much as digits as its factorization.

845820617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 845820617 is about 29082.9953237283. The cubic root of 845820617 is about 945.7131378755.

The spelling of 845820617 in words is "eight hundred forty-five million, eight hundred twenty thousand, six hundred seventeen".