42117841 has 2 divisors, whose sum is σ = 42117842. Its totient is φ = 42117840.

The previous prime is 42117821. The next prime is 42117893. The reversal of 42117841 is 14871124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25796241 + 16321600 = 5079^2 + 4040^2 .

It is a cyclic number.

It is not a de Polignac number, because 42117841 - 2¹⁹ = 41593553 is a prime.

It is equal to p_2554336 and since 42117841 and 2554336 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42117821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21058920 + 21058921.

It is an arithmetic number, because the mean of its divisors is an integer number (21058921).

Almost surely, 2^42117841 is an apocalyptic number.

It is an amenable number.

42117841 is a deficient number, since it is larger than the sum of its proper divisors (1).

42117841 is an equidigital number, since it uses as much as digits as its factorization.

42117841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 28.

The square root of 42117841 is about 6489.8259606865. The cubic root of 42117841 is about 347.9274549314.

Adding to 42117841 its reverse (14871124), we get a palindrome (56988965).

The spelling of 42117841 in words is "forty-two million, one hundred seventeen thousand, eight hundred forty-one".