42255589 has 2 divisors, whose sum is σ = 42255590. Its totient is φ = 42255588.

The previous prime is 42255571. The next prime is 42255593. The reversal of 42255589 is 98555224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40742689 + 1512900 = 6383^2 + 1230^2 .

It is a cyclic number.

It is not a de Polignac number, because 42255589 - 2²³ = 33866981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42255569) 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, 21127794 + 21127795.

It is an arithmetic number, because the mean of its divisors is an integer number (21127795).

Almost surely, 2^42255589 is an apocalyptic number.

It is an amenable number.

42255589 is a deficient number, since it is larger than the sum of its proper divisors (1).

42255589 is an equidigital number, since it uses as much as digits as its factorization.

42255589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144000, while the sum is 40.

The square root of 42255589 is about 6500.4299088599. The cubic root of 42255589 is about 348.3063454948.

The spelling of 42255589 in words is "forty-two million, two hundred fifty-five thousand, five hundred eighty-nine".