42563581 has 2 divisors, whose sum is σ = 42563582. Its totient is φ = 42563580.

The previous prime is 42563567. The next prime is 42563671. The reversal of 42563581 is 18536524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32387481 + 10176100 = 5691^2 + 3190^2 .

It is a cyclic number.

It is not a de Polignac number, because 42563581 - 2⁹ = 42563069 is a prime.

It is a super-2 number, since 2×42563581² = 3623316855087122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42563551) 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, 21281790 + 21281791.

It is an arithmetic number, because the mean of its divisors is an integer number (21281791).

Almost surely, 2^42563581 is an apocalyptic number.

It is an amenable number.

42563581 is a deficient number, since it is larger than the sum of its proper divisors (1).

42563581 is an equidigital number, since it uses as much as digits as its factorization.

42563581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 34.

The square root of 42563581 is about 6524.0770228439. The cubic root of 42563581 is about 349.1505413714.

The spelling of 42563581 in words is "forty-two million, five hundred sixty-three thousand, five hundred eighty-one".