72031111 has 2 divisors, whose sum is σ = 72031112. Its totient is φ = 72031110.

The previous prime is 72031087. The next prime is 72031123. The reversal of 72031111 is 11113027.

It is a strong prime.

It is an emirp because it is prime and its reverse (11113027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72031111 - 2¹⁵ = 71998343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72031151) 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, 36015555 + 36015556.

It is an arithmetic number, because the mean of its divisors is an integer number (36015556).

Almost surely, 2^72031111 is an apocalyptic number.

72031111 is a deficient number, since it is larger than the sum of its proper divisors (1).

72031111 is an equidigital number, since it uses as much as digits as its factorization.

72031111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42, while the sum is 16.

The square root of 72031111 is about 8487.1144095034. The cubic root of 72031111 is about 416.0766758782.

Adding to 72031111 its reverse (11113027), we get a palindrome (83144138).

The spelling of 72031111 in words is "seventy-two million, thirty-one thousand, one hundred eleven".