42004481 has 2 divisors, whose sum is σ = 42004482. Its totient is φ = 42004480.

The previous prime is 42004477. The next prime is 42004483. The reversal of 42004481 is 18440024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29866225 + 12138256 = 5465^2 + 3484^2 .

It is a cyclic number.

It is not a de Polignac number, because 42004481 - 2² = 42004477 is a prime.

It is a super-2 number, since 2×42004481² = 3528752848158722, which contains 22 as substring.

Together with 42004483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42004483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21002240 + 21002241.

It is an arithmetic number, because the mean of its divisors is an integer number (21002241).

Almost surely, 2^42004481 is an apocalyptic number.

It is an amenable number.

42004481 is a deficient number, since it is larger than the sum of its proper divisors (1).

42004481 is an equidigital number, since it uses as much as digits as its factorization.

42004481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 42004481 is about 6481.0864058428. The cubic root of 42004481 is about 347.6150260136.

The spelling of 42004481 in words is "forty-two million, four thousand, four hundred eighty-one".