72011911 has 4 divisors (see below), whose sum is σ = 72179424. Its totient is φ = 71844400.

The previous prime is 72011909. The next prime is 72011917. The reversal of 72011911 is 11911027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72011911 - 2¹ = 72011909 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 (72011917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83110 + ... + 83971.

It is an arithmetic number, because the mean of its divisors is an integer number (18044856).

Almost surely, 2^72011911 is an apocalyptic number.

72011911 is a deficient number, since it is larger than the sum of its proper divisors (167513).

72011911 is a wasteful number, since it uses less digits than its factorization.

72011911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167512.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 72011911 is about 8485.9832076195. The cubic root of 72011911 is about 416.0397039736.

Adding to 72011911 its reverse (11911027), we get a palindrome (83922938).

The spelling of 72011911 in words is "seventy-two million, eleven thousand, nine hundred eleven".