42758581 has 2 divisors, whose sum is σ = 42758582. Its totient is φ = 42758580.

The previous prime is 42758567. The next prime is 42758593. The reversal of 42758581 is 18585724.

42758581 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., 42315025 + 443556 = 6505^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 42758581 - 2⁵ = 42758549 is a prime.

It is a super-2 number, since 2×42758581² = 3656592498267122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42758561) 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, 21379290 + 21379291.

It is an arithmetic number, because the mean of its divisors is an integer number (21379291).

Almost surely, 2^42758581 is an apocalyptic number.

It is an amenable number.

42758581 is a deficient number, since it is larger than the sum of its proper divisors (1).

42758581 is an equidigital number, since it uses as much as digits as its factorization.

42758581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 89600, while the sum is 40.

The square root of 42758581 is about 6539.0045878559. The cubic root of 42758581 is about 349.6829264475.

The spelling of 42758581 in words is "forty-two million, seven hundred fifty-eight thousand, five hundred eighty-one".