422581 has 2 divisors, whose sum is σ = 422582. Its totient is φ = 422580.

The previous prime is 422573. The next prime is 422621. The reversal of 422581 is 185224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422500 + 81 = 650^2 + 9^2 .

It is a cyclic number.

It is not a de Polignac number, because 422581 - 2³ = 422573 is a prime.

It is a super-2 number, since 2×422581² = 357149403122, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422551) 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, 211290 + 211291.

It is an arithmetic number, because the mean of its divisors is an integer number (211291).

2⁴²²⁵⁸¹ is an apocalyptic number.

It is an amenable number.

422581 is a deficient number, since it is larger than the sum of its proper divisors (1).

422581 is an equidigital number, since it uses as much as digits as its factorization.

422581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 22.

The square root of 422581 is about 650.0623047062. The cubic root of 422581 is about 75.0418137209.

It can be divided in two parts, 4225 and 81, that multiplied together give a square (342225 = 585²).

The spelling of 422581 in words is "four hundred twenty-two thousand, five hundred eighty-one".