42522581 has 2 divisors, whose sum is σ = 42522582. Its totient is φ = 42522580.

The previous prime is 42522533. The next prime is 42522611. The reversal of 42522581 is 18522524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38254225 + 4268356 = 6185^2 + 2066^2 .

It is a cyclic number.

It is not a de Polignac number, because 42522581 - 2¹⁴ = 42506197 is a prime.

It is a super-2 number, since 2×42522581² = 3616339789803122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42522481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21261290 + 21261291.

It is an arithmetic number, because the mean of its divisors is an integer number (21261291).

Almost surely, 2^42522581 is an apocalyptic number.

It is an amenable number.

42522581 is a deficient number, since it is larger than the sum of its proper divisors (1).

42522581 is an equidigital number, since it uses as much as digits as its factorization.

42522581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6400, while the sum is 29.

The square root of 42522581 is about 6520.9340588600. The cubic root of 42522581 is about 349.0383972116.

The spelling of 42522581 in words is "forty-two million, five hundred twenty-two thousand, five hundred eighty-one".