42220517 has 2 divisors, whose sum is σ = 42220518. Its totient is φ = 42220516.

The previous prime is 42220513. The next prime is 42220559. The reversal of 42220517 is 71502224.

It is a happy number.

42220517 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., 42003361 + 217156 = 6481^2 + 466^2 .

It is a cyclic number.

It is not a de Polignac number, because 42220517 - 2² = 42220513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42220492 and 42220501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42220513) 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, 21110258 + 21110259.

It is an arithmetic number, because the mean of its divisors is an integer number (21110259).

Almost surely, 2^42220517 is an apocalyptic number.

It is an amenable number.

42220517 is a deficient number, since it is larger than the sum of its proper divisors (1).

42220517 is an equidigital number, since it uses as much as digits as its factorization.

42220517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 42220517 is about 6497.7316811330. The cubic root of 42220517 is about 348.2099544477.

The spelling of 42220517 in words is "forty-two million, two hundred twenty thousand, five hundred seventeen".