72111061 has 16 divisors (see below), whose sum is σ = 83684160. Its totient is φ = 61447680.

The previous prime is 72111047. The next prime is 72111073. The reversal of 72111061 is 16011127.

It is a cyclic number.

It is not a de Polignac number, because 72111061 - 2¹¹ = 72109013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72111001) 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 15 ways as a sum of consecutive naturals, for example, 18495 + ... + 22051.

It is an arithmetic number, because the mean of its divisors is an integer number (5230260).

Almost surely, 2^72111061 is an apocalyptic number.

It is an amenable number.

72111061 is a deficient number, since it is larger than the sum of its proper divisors (11573099).

72111061 is a wasteful number, since it uses less digits than its factorization.

72111061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684.

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

The square root of 72111061 is about 8491.8231846877. The cubic root of 72111061 is about 416.2305586004.

Adding to 72111061 its reverse (16011127), we get a palindrome (88122188).

The spelling of 72111061 in words is "seventy-two million, one hundred eleven thousand, sixty-one".