43139543 has 2 divisors, whose sum is σ = 43139544. Its totient is φ = 43139542.

The previous prime is 43139539. The next prime is 43139549. The reversal of 43139543 is 34593134.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43139543 - 2² = 43139539 is a prime.

It is a super-2 number, since 2×43139543² = 3722040340497698, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43139549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21569771 + 21569772.

It is an arithmetic number, because the mean of its divisors is an integer number (21569772).

Almost surely, 2^43139543 is an apocalyptic number.

43139543 is a deficient number, since it is larger than the sum of its proper divisors (1).

43139543 is an equidigital number, since it uses as much as digits as its factorization.

43139543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 32.

The square root of 43139543 is about 6568.0699600415. The cubic root of 43139543 is about 350.7183694473.

The spelling of 43139543 in words is "forty-three million, one hundred thirty-nine thousand, five hundred forty-three".