42172717 has 2 divisors, whose sum is σ = 42172718. Its totient is φ = 42172716.

The previous prime is 42172673. The next prime is 42172721. The reversal of 42172717 is 71727124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37380996 + 4791721 = 6114^2 + 2189^2 .

It is a cyclic number.

It is not a de Polignac number, because 42172717 - 2¹⁹ = 41648429 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42172727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21086358 + 21086359.

It is an arithmetic number, because the mean of its divisors is an integer number (21086359).

Almost surely, 2^42172717 is an apocalyptic number.

It is an amenable number.

42172717 is a deficient number, since it is larger than the sum of its proper divisors (1).

42172717 is an equidigital number, since it uses as much as digits as its factorization.

42172717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5488, while the sum is 31.

The square root of 42172717 is about 6494.0524328034. The cubic root of 42172717 is about 348.0784960771.

The spelling of 42172717 in words is "forty-two million, one hundred seventy-two thousand, seven hundred seventeen".