72155543 has 2 divisors, whose sum is σ = 72155544. Its totient is φ = 72155542.

The previous prime is 72155537. The next prime is 72155621. The reversal of 72155543 is 34555127.

It is a weak prime.

It is an emirp because it is prime and its reverse (34555127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72155543 - 2⁸ = 72155287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72155243) 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, 36077771 + 36077772.

It is an arithmetic number, because the mean of its divisors is an integer number (36077772).

Almost surely, 2^72155543 is an apocalyptic number.

72155543 is a deficient number, since it is larger than the sum of its proper divisors (1).

72155543 is an equidigital number, since it uses as much as digits as its factorization.

72155543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21000, while the sum is 32.

The square root of 72155543 is about 8494.4418886705. The cubic root of 72155543 is about 416.3161255106.

The spelling of 72155543 in words is "seventy-two million, one hundred fifty-five thousand, five hundred forty-three".