42305491 has 2 divisors, whose sum is σ = 42305492. Its totient is φ = 42305490.

The previous prime is 42305489. The next prime is 42305531. The reversal of 42305491 is 19450324.

42305491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42305491 - 2¹ = 42305489 is a prime.

Together with 42305489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42305591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21152745 + 21152746.

It is an arithmetic number, because the mean of its divisors is an integer number (21152746).

Almost surely, 2^42305491 is an apocalyptic number.

42305491 is a deficient number, since it is larger than the sum of its proper divisors (1).

42305491 is an equidigital number, since it uses as much as digits as its factorization.

42305491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 42305491 is about 6504.2671378104. The cubic root of 42305491 is about 348.4434030692.

The spelling of 42305491 in words is "forty-two million, three hundred five thousand, four hundred ninety-one".