42644543 has 2 divisors, whose sum is σ = 42644544. Its totient is φ = 42644542.

The previous prime is 42644527. The next prime is 42644573. The reversal of 42644543 is 34544624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42644543 - 2⁴ = 42644527 is a prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42644573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21322271 + 21322272.

It is an arithmetic number, because the mean of its divisors is an integer number (21322272).

Almost surely, 2^42644543 is an apocalyptic number.

42644543 is a deficient number, since it is larger than the sum of its proper divisors (1).

42644543 is an equidigital number, since it uses as much as digits as its factorization.

42644543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 32.

The square root of 42644543 is about 6530.2789373809. The cubic root of 42644543 is about 349.3717791932.

The spelling of 42644543 in words is "forty-two million, six hundred forty-four thousand, five hundred forty-three".