42534581 has 2 divisors, whose sum is σ = 42534582. Its totient is φ = 42534580.

The previous prime is 42534553. The next prime is 42534587. The reversal of 42534581 is 18543524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24344356 + 18190225 = 4934^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 42534581 - 2¹⁴ = 42518197 is a prime.

It is a super-2 number, since 2×42534581² = 3618381161691122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42534587) 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, 21267290 + 21267291.

It is an arithmetic number, because the mean of its divisors is an integer number (21267291).

Almost surely, 2^42534581 is an apocalyptic number.

It is an amenable number.

42534581 is a deficient number, since it is larger than the sum of its proper divisors (1).

42534581 is an equidigital number, since it uses as much as digits as its factorization.

42534581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 32.

The square root of 42534581 is about 6521.8541075372. The cubic root of 42534581 is about 349.0712273513.

The spelling of 42534581 in words is "forty-two million, five hundred thirty-four thousand, five hundred eighty-one".