42143317 has 2 divisors, whose sum is σ = 42143318. Its totient is φ = 42143316.

The previous prime is 42143281. The next prime is 42143327. The reversal of 42143317 is 71334124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26071236 + 16072081 = 5106^2 + 4009^2 .

It is a cyclic number.

It is not a de Polignac number, because 42143317 - 2²³ = 33754709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42143291 and 42143300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42143327) 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, 21071658 + 21071659.

It is an arithmetic number, because the mean of its divisors is an integer number (21071659).

Almost surely, 2^42143317 is an apocalyptic number.

It is an amenable number.

42143317 is a deficient number, since it is larger than the sum of its proper divisors (1).

42143317 is an equidigital number, since it uses as much as digits as its factorization.

42143317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 25.

The square root of 42143317 is about 6491.7884284687. The cubic root of 42143317 is about 347.9975915850.

The spelling of 42143317 in words is "forty-two million, one hundred forty-three thousand, three hundred seventeen".