42543643 has 2 divisors, whose sum is σ = 42543644. Its totient is φ = 42543642.

The previous prime is 42543637. The next prime is 42543647. The reversal of 42543643 is 34634524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42543643 - 2²¹ = 40446491 is a prime.

It is a super-2 number, since 2×42543643² = 3619923119422898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42543647) 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, 21271821 + 21271822.

It is an arithmetic number, because the mean of its divisors is an integer number (21271822).

Almost surely, 2^42543643 is an apocalyptic number.

42543643 is a deficient number, since it is larger than the sum of its proper divisors (1).

42543643 is an equidigital number, since it uses as much as digits as its factorization.

42543643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 31.

The square root of 42543643 is about 6522.5488116226. The cubic root of 42543643 is about 349.0960154866.

The spelling of 42543643 in words is "forty-two million, five hundred forty-three thousand, six hundred forty-three".