42425891 has 2 divisors, whose sum is σ = 42425892. Its totient is φ = 42425890.

The previous prime is 42425833. The next prime is 42425893. The reversal of 42425891 is 19852424.

42425891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42425891 - 2⁶ = 42425827 is a prime.

It is a Sophie Germain prime.

Together with 42425893, 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 (42425893) 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, 21212945 + 21212946.

It is an arithmetic number, because the mean of its divisors is an integer number (21212946).

Almost surely, 2^42425891 is an apocalyptic number.

42425891 is a deficient number, since it is larger than the sum of its proper divisors (1).

42425891 is an equidigital number, since it uses as much as digits as its factorization.

42425891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 35.

The square root of 42425891 is about 6513.5160243911. The cubic root of 42425891 is about 348.7736427063.

The spelling of 42425891 in words is "forty-two million, four hundred twenty-five thousand, eight hundred ninety-one".