72103111 has 4 divisors (see below), whose sum is σ = 72230400. Its totient is φ = 71975824.

The previous prime is 72103079. The next prime is 72103139. The reversal of 72103111 is 11130127.

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 72103111 - 2⁵ = 72103079 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 (72103211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62791 + ... + 63928.

It is an arithmetic number, because the mean of its divisors is an integer number (18057600).

Almost surely, 2^72103111 is an apocalyptic number.

72103111 is a deficient number, since it is larger than the sum of its proper divisors (127289).

72103111 is a wasteful number, since it uses less digits than its factorization.

72103111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127288.

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

The square root of 72103111 is about 8491.3550744272. The cubic root of 72103111 is about 416.2152620356.

Adding to 72103111 its reverse (11130127), we get a palindrome (83233238).

The spelling of 72103111 in words is "seventy-two million, one hundred three thousand, one hundred eleven".