42885881 has 2 divisors, whose sum is σ = 42885882. Its totient is φ = 42885880.

The previous prime is 42885853. The next prime is 42885889. The reversal of 42885881 is 18858824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38241856 + 4644025 = 6184^2 + 2155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42885881 is a prime.

It is a super-2 number, since 2×42885881² = 3678397578292322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42885889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21442940 + 21442941.

It is an arithmetic number, because the mean of its divisors is an integer number (21442941).

Almost surely, 2^42885881 is an apocalyptic number.

It is an amenable number.

42885881 is a deficient number, since it is larger than the sum of its proper divisors (1).

42885881 is an equidigital number, since it uses as much as digits as its factorization.

42885881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163840, while the sum is 44.

The square root of 42885881 is about 6548.7312511661. The cubic root of 42885881 is about 350.0296056589.

The spelling of 42885881 in words is "forty-two million, eight hundred eighty-five thousand, eight hundred eighty-one".