42168899 has 2 divisors, whose sum is σ = 42168900. Its totient is φ = 42168898.

The previous prime is 42168887. The next prime is 42168901. The reversal of 42168899 is 99886124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42168899 - 2²⁰ = 41120323 is a prime.

Together with 42168901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42168829) 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, 21084449 + 21084450.

It is an arithmetic number, because the mean of its divisors is an integer number (21084450).

Almost surely, 2^42168899 is an apocalyptic number.

42168899 is a deficient number, since it is larger than the sum of its proper divisors (1).

42168899 is an equidigital number, since it uses as much as digits as its factorization.

42168899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 42168899 is about 6493.7584648646. The cubic root of 42168899 is about 348.0679916254.

The spelling of 42168899 in words is "forty-two million, one hundred sixty-eight thousand, eight hundred ninety-nine".