72544441 has 2 divisors, whose sum is σ = 72544442. Its totient is φ = 72544440.

The previous prime is 72544429. The next prime is 72544447. The reversal of 72544441 is 14444527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65934400 + 6610041 = 8120^2 + 2571^2 .

It is an emirp because it is prime and its reverse (14444527) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72544441 - 2²⁵ = 38990009 is a prime.

It is not a weakly prime, because it can be changed into another prime (72544447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36272220 + 36272221.

It is an arithmetic number, because the mean of its divisors is an integer number (36272221).

Almost surely, 2^72544441 is an apocalyptic number.

It is an amenable number.

72544441 is a deficient number, since it is larger than the sum of its proper divisors (1).

72544441 is an equidigital number, since it uses as much as digits as its factorization.

72544441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17920, while the sum is 31.

The square root of 72544441 is about 8517.3024485455. The cubic root of 72544441 is about 417.0627279037.

Adding to 72544441 its reverse (14444527), we get a palindrome (86988968).

The spelling of 72544441 in words is "seventy-two million, five hundred forty-four thousand, four hundred forty-one".