42006041989 has 2 divisors, whose sum is σ = 42006041990. Its totient is φ = 42006041988.

The previous prime is 42006041951. The next prime is 42006042031. The reversal of 42006041989 is 98914060024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25222839489 + 16783202500 = 158817^2 + 129550^2 .

It is a cyclic number.

It is not a de Polignac number, because 42006041989 - 2¹¹ = 42006039941 is a prime.

It is a super-2 number, since 2×42006041989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42006041689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21003020994 + 21003020995.

It is an arithmetic number, because the mean of its divisors is an integer number (21003020995).

Almost surely, 2^42006041989 is an apocalyptic number.

It is an amenable number.

42006041989 is a deficient number, since it is larger than the sum of its proper divisors (1).

42006041989 is an equidigital number, since it uses as much as digits as its factorization.

42006041989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 42006041989 in words is "forty-two billion, six million, forty-one thousand, nine hundred eighty-nine".