42556849 has 2 divisors, whose sum is σ = 42556850. Its totient is φ = 42556848.

The previous prime is 42556847. The next prime is 42556853. The reversal of 42556849 is 94865524.

42556849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35760400 + 6796449 = 5980^2 + 2607^2 .

It is a cyclic number.

It is not a de Polignac number, because 42556849 - 2¹ = 42556847 is a prime.

It is a super-2 number, since 2×42556849² = 3622170793617602, which contains 22 as substring.

Together with 42556847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42556841) 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, 21278424 + 21278425.

It is an arithmetic number, because the mean of its divisors is an integer number (21278425).

Almost surely, 2^42556849 is an apocalyptic number.

It is an amenable number.

42556849 is a deficient number, since it is larger than the sum of its proper divisors (1).

42556849 is an equidigital number, since it uses as much as digits as its factorization.

42556849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 43.

The square root of 42556849 is about 6523.5610673926. The cubic root of 42556849 is about 349.1321327905.

The spelling of 42556849 in words is "forty-two million, five hundred fifty-six thousand, eight hundred forty-nine".