42168901 has 2 divisors, whose sum is σ = 42168902. Its totient is φ = 42168900.

The previous prime is 42168899. The next prime is 42168911. The reversal of 42168901 is 10986124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31922500 + 10246401 = 5650^2 + 3201^2 .

It is a cyclic number.

It is not a de Polignac number, because 42168901 - 2¹ = 42168899 is a prime.

Together with 42168899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42168911) 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, 21084450 + 21084451.

It is an arithmetic number, because the mean of its divisors is an integer number (21084451).

Almost surely, 2^42168901 is an apocalyptic number.

It is an amenable number.

42168901 is a deficient number, since it is larger than the sum of its proper divisors (1).

42168901 is an equidigital number, since it uses as much as digits as its factorization.

42168901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 42168901 is about 6493.7586188586. The cubic root of 42168901 is about 348.0679971282.

The spelling of 42168901 in words is "forty-two million, one hundred sixty-eight thousand, nine hundred one".