72061111 has 4 divisors (see below), whose sum is σ = 72078192. Its totient is φ = 72044032.

The previous prime is 72061109. The next prime is 72061123. The reversal of 72061111 is 11116027.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11116027 = 13 ⋅855079.

It is a cyclic number.

It is not a de Polignac number, because 72061111 - 2¹ = 72061109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72061141) 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 in 3 ways as a sum of consecutive naturals, for example, 2871 + ... + 12343.

It is an arithmetic number, because the mean of its divisors is an integer number (18019548).

Almost surely, 2^72061111 is an apocalyptic number.

72061111 is a deficient number, since it is larger than the sum of its proper divisors (17081).

72061111 is an equidigital number, since it uses as much as digits as its factorization.

72061111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17080.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 72061111 is about 8488.8816106717. The cubic root of 72061111 is about 416.1344313286.

Adding to 72061111 its reverse (11116027), we get a palindrome (83177138).

The spelling of 72061111 in words is "seventy-two million, sixty-one thousand, one hundred eleven".