42117689 has 2 divisors, whose sum is σ = 42117690. Its totient is φ = 42117688.

The previous prime is 42117671. The next prime is 42117703. The reversal of 42117689 is 98671124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27040000 + 15077689 = 5200^2 + 3883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42117689 is a prime.

It is not a weakly prime, because it can be changed into another prime (42117659) 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, 21058844 + 21058845.

It is an arithmetic number, because the mean of its divisors is an integer number (21058845).

Almost surely, 2^42117689 is an apocalyptic number.

It is an amenable number.

42117689 is a deficient number, since it is larger than the sum of its proper divisors (1).

42117689 is an equidigital number, since it uses as much as digits as its factorization.

42117689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 42117689 is about 6489.8142500383. The cubic root of 42117689 is about 347.9270363832.

The spelling of 42117689 in words is "forty-two million, one hundred seventeen thousand, six hundred eighty-nine".