845242819 has 2 divisors, whose sum is σ = 845242820. Its totient is φ = 845242818.

The previous prime is 845242753. The next prime is 845242889. The reversal of 845242819 is 918242548.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 845242819 - 2²⁹ = 308371907 is a prime.

It is a super-2 number, since 2×845242819² = 1428870846142133522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (845242889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422621409 + 422621410.

It is an arithmetic number, because the mean of its divisors is an integer number (422621410).

Almost surely, 2^845242819 is an apocalyptic number.

845242819 is a deficient number, since it is larger than the sum of its proper divisors (1).

845242819 is an equidigital number, since it uses as much as digits as its factorization.

845242819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 184320, while the sum is 43.

The square root of 845242819 is about 29073.0600212637. The cubic root of 845242819 is about 945.4977432547.

The spelling of 845242819 in words is "eight hundred forty-five million, two hundred forty-two thousand, eight hundred nineteen".