42144539 has 2 divisors, whose sum is σ = 42144540. Its totient is φ = 42144538.

The previous prime is 42144521. The next prime is 42144551. The reversal of 42144539 is 93544124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42144539 - 2¹² = 42140443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42144559) 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, 21072269 + 21072270.

It is an arithmetic number, because the mean of its divisors is an integer number (21072270).

Almost surely, 2^42144539 is an apocalyptic number.

42144539 is a deficient number, since it is larger than the sum of its proper divisors (1).

42144539 is an equidigital number, since it uses as much as digits as its factorization.

42144539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 32.

The square root of 42144539 is about 6491.8825466886. The cubic root of 42144539 is about 348.0009550993. Note that the first 3 decimals are identical.

The spelling of 42144539 in words is "forty-two million, one hundred forty-four thousand, five hundred thirty-nine".