138445543 has 2 divisors, whose sum is σ = 138445544. Its totient is φ = 138445542.

The previous prime is 138445537. The next prime is 138445553. The reversal of 138445543 is 345544831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138445543 - 2⁵ = 138445511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138445513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69222771 + 69222772.

It is an arithmetic number, because the mean of its divisors is an integer number (69222772).

Almost surely, 2^138445543 is an apocalyptic number.

138445543 is a deficient number, since it is larger than the sum of its proper divisors (1).

138445543 is an equidigital number, since it uses as much as digits as its factorization.

138445543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 37.

The square root of 138445543 is about 11766.2884122394. The cubic root of 138445543 is about 517.3204654666.

The spelling of 138445543 in words is "one hundred thirty-eight million, four hundred forty-five thousand, five hundred forty-three".