42068561 has 2 divisors, whose sum is σ = 42068562. Its totient is φ = 42068560.

The previous prime is 42068549. The next prime is 42068567. The reversal of 42068561 is 16586024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26584336 + 15484225 = 5156^2 + 3935^2 .

It is a cyclic number.

It is not a de Polignac number, because 42068561 - 2⁶ = 42068497 is a prime.

It is a super-2 number, since 2×42068561² = 3539527649221442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42068567) 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, 21034280 + 21034281.

It is an arithmetic number, because the mean of its divisors is an integer number (21034281).

Almost surely, 2^42068561 is an apocalyptic number.

It is an amenable number.

42068561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42068561 is an equidigital number, since it uses as much as digits as its factorization.

42068561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 42068561 is about 6486.0281374659. The cubic root of 42068561 is about 347.7917044110.

The spelling of 42068561 in words is "forty-two million, sixty-eight thousand, five hundred sixty-one".