42117997 has 2 divisors, whose sum is σ = 42117998. Its totient is φ = 42117996.

The previous prime is 42117961. The next prime is 42118019. The reversal of 42117997 is 79971124.

42117997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29909961 + 12208036 = 5469^2 + 3494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42117997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42117197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21058998 + 21058999.

It is an arithmetic number, because the mean of its divisors is an integer number (21058999).

Almost surely, 2^42117997 is an apocalyptic number.

It is an amenable number.

42117997 is a deficient number, since it is larger than the sum of its proper divisors (1).

42117997 is an equidigital number, since it uses as much as digits as its factorization.

42117997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 40.

The square root of 42117997 is about 6489.8379794876. The cubic root of 42117997 is about 347.9278844929.

The spelling of 42117997 in words is "forty-two million, one hundred seventeen thousand, nine hundred ninety-seven".