845242549 has 2 divisors, whose sum is σ = 845242550. Its totient is φ = 845242548.

The previous prime is 845242507. The next prime is 845242553. The reversal of 845242549 is 945242548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 813960900 + 31281649 = 28530^2 + 5593^2 .

It is a cyclic number.

It is not a de Polignac number, because 845242549 - 2⁷ = 845242421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (845242589) 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, 422621274 + 422621275.

It is an arithmetic number, because the mean of its divisors is an integer number (422621275).

Almost surely, 2^845242549 is an apocalyptic number.

It is an amenable number.

845242549 is a deficient number, since it is larger than the sum of its proper divisors (1).

845242549 is an equidigital number, since it uses as much as digits as its factorization.

845242549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 460800, while the sum is 43.

The square root of 845242549 is about 29073.0553777892. The cubic root of 845242549 is about 945.4976425797.

Subtracting 845242549 from its reverse (945242548), we obtain a palindrome (99999999).

The spelling of 845242549 in words is "eight hundred forty-five million, two hundred forty-two thousand, five hundred forty-nine".