72817111 has 2 divisors, whose sum is σ = 72817112. Its totient is φ = 72817110.

The previous prime is 72817099. The next prime is 72817117. The reversal of 72817111 is 11171827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72817111 - 2⁵ = 72817079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72817111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72817117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36408555 + 36408556.

It is an arithmetic number, because the mean of its divisors is an integer number (36408556).

Almost surely, 2^72817111 is an apocalyptic number.

72817111 is a deficient number, since it is larger than the sum of its proper divisors (1).

72817111 is an equidigital number, since it uses as much as digits as its factorization.

72817111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 28.

The square root of 72817111 is about 8533.2942642335. The cubic root of 72817111 is about 417.5846071374.

Adding to 72817111 its reverse (11171827), we get a palindrome (83988938).

The spelling of 72817111 in words is "seventy-two million, eight hundred seventeen thousand, one hundred eleven".