42131717 has 2 divisors, whose sum is σ = 42131718. Its totient is φ = 42131716.

The previous prime is 42131681. The next prime is 42131737. The reversal of 42131717 is 71713124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36590401 + 5541316 = 6049^2 + 2354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42131717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42131737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21065858 + 21065859.

It is an arithmetic number, because the mean of its divisors is an integer number (21065859).

Almost surely, 2^42131717 is an apocalyptic number.

It is an amenable number.

42131717 is a deficient number, since it is larger than the sum of its proper divisors (1).

42131717 is an equidigital number, since it uses as much as digits as its factorization.

42131717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1176, while the sum is 26.

The square root of 42131717 is about 6490.8949305932. The cubic root of 42131717 is about 347.9656597330.

The spelling of 42131717 in words is "forty-two million, one hundred thirty-one thousand, seven hundred seventeen".