42660881 has 2 divisors, whose sum is σ = 42660882. Its totient is φ = 42660880.

The previous prime is 42660853. The next prime is 42660887. The reversal of 42660881 is 18806624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42250000 + 410881 = 6500^2 + 641^2 .

It is a cyclic number.

It is not a de Polignac number, because 42660881 - 2²² = 38466577 is a prime.

It is a super-2 number, since 2×42660881² = 3639901535392322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42660887) 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, 21330440 + 21330441.

It is an arithmetic number, because the mean of its divisors is an integer number (21330441).

Almost surely, 2^42660881 is an apocalyptic number.

It is an amenable number.

42660881 is a deficient number, since it is larger than the sum of its proper divisors (1).

42660881 is an equidigital number, since it uses as much as digits as its factorization.

42660881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 42660881 is about 6531.5297595586. The cubic root of 42660881 is about 349.4163906637.

The spelling of 42660881 in words is "forty-two million, six hundred sixty thousand, eight hundred eighty-one".