42030581 has 2 divisors, whose sum is σ = 42030582. Its totient is φ = 42030580.

The previous prime is 42030577. The next prime is 42030587. The reversal of 42030581 is 18503024.

42030581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41280625 + 749956 = 6425^2 + 866^2 .

It is a cyclic number.

It is not a de Polignac number, because 42030581 - 2² = 42030577 is a prime.

It is a super-2 number, since 2×42030581² = 3533139478395122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42030587) 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, 21015290 + 21015291.

It is an arithmetic number, because the mean of its divisors is an integer number (21015291).

Almost surely, 2^42030581 is an apocalyptic number.

It is an amenable number.

42030581 is a deficient number, since it is larger than the sum of its proper divisors (1).

42030581 is an equidigital number, since it uses as much as digits as its factorization.

42030581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 42030581 is about 6483.0996444602. The cubic root of 42030581 is about 347.6870093946.

The spelling of 42030581 in words is "forty-two million, thirty thousand, five hundred eighty-one".