42239231 has 2 divisors, whose sum is σ = 42239232. Its totient is φ = 42239230.

The previous prime is 42239227. The next prime is 42239233. The reversal of 42239231 is 13293224.

42239231 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 42239231 - 2² = 42239227 is a prime.

It is a super-2 number, since 2×42239231² = 3568305270942722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 42239233, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42239231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42239233) 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, 21119615 + 21119616.

It is an arithmetic number, because the mean of its divisors is an integer number (21119616).

Almost surely, 2^42239231 is an apocalyptic number.

42239231 is a deficient number, since it is larger than the sum of its proper divisors (1).

42239231 is an equidigital number, since it uses as much as digits as its factorization.

42239231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 42239231 is about 6499.1715625917. The cubic root of 42239231 is about 348.2613941979.

The spelling of 42239231 in words is "forty-two million, two hundred thirty-nine thousand, two hundred thirty-one".