42042317 has 2 divisors, whose sum is σ = 42042318. Its totient is φ = 42042316.

The previous prime is 42042313. The next prime is 42042331. The reversal of 42042317 is 71324024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41550916 + 491401 = 6446^2 + 701^2 .

It is a cyclic number.

It is not a de Polignac number, because 42042317 - 2² = 42042313 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42042292 and 42042301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42042311) 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, 21021158 + 21021159.

It is an arithmetic number, because the mean of its divisors is an integer number (21021159).

Almost surely, 2^42042317 is an apocalyptic number.

It is an amenable number.

42042317 is a deficient number, since it is larger than the sum of its proper divisors (1).

42042317 is an equidigital number, since it uses as much as digits as its factorization.

42042317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 42042317 is about 6484.0047038848. The cubic root of 42042317 is about 347.7193673818.

The spelling of 42042317 in words is "forty-two million, forty-two thousand, three hundred seventeen".