42555517 has 2 divisors, whose sum is σ = 42555518. Its totient is φ = 42555516.

The previous prime is 42555493. The next prime is 42555523. The reversal of 42555517 is 71555524.

42555517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35868121 + 6687396 = 5989^2 + 2586^2 .

It is a cyclic number.

It is not a de Polignac number, because 42555517 - 2⁷ = 42555389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42555577) 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, 21277758 + 21277759.

It is an arithmetic number, because the mean of its divisors is an integer number (21277759).

Almost surely, 2^42555517 is an apocalyptic number.

It is an amenable number.

42555517 is a deficient number, since it is larger than the sum of its proper divisors (1).

42555517 is an equidigital number, since it uses as much as digits as its factorization.

42555517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35000, while the sum is 34.

The square root of 42555517 is about 6523.4589751144. The cubic root of 42555517 is about 349.1284902209.

The spelling of 42555517 in words is "forty-two million, five hundred fifty-five thousand, five hundred seventeen".