845167649 has 2 divisors, whose sum is σ = 845167650. Its totient is φ = 845167648.

The previous prime is 845167643. The next prime is 845167667. The reversal of 845167649 is 946761548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 760656400 + 84511249 = 27580^2 + 9193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845167649 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 845167597 and 845167606.

It is not a weakly prime, because it can be changed into another prime (845167643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422583824 + 422583825.

It is an arithmetic number, because the mean of its divisors is an integer number (422583825).

Almost surely, 2^845167649 is an apocalyptic number.

It is an amenable number.

845167649 is a deficient number, since it is larger than the sum of its proper divisors (1).

845167649 is an equidigital number, since it uses as much as digits as its factorization.

845167649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 50.

The square root of 845167649 is about 29071.7672149458. The cubic root of 845167649 is about 945.4697137659.

The spelling of 845167649 in words is "eight hundred forty-five million, one hundred sixty-seven thousand, six hundred forty-nine".