72111401 has 4 divisors (see below), whose sum is σ = 72269652. Its totient is φ = 71953152.

The previous prime is 72111383. The next prime is 72111421. The reversal of 72111401 is 10411127.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50395801 + 21715600 = 7099^2 + 4660^2 .

It is a cyclic number.

It is not a de Polignac number, because 72111401 - 2⁶ = 72111337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72111401.

It is not an unprimeable number, because it can be changed into a prime (72111421) 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, 78440 + ... + 79353.

It is an arithmetic number, because the mean of its divisors is an integer number (18067413).

Almost surely, 2^72111401 is an apocalyptic number.

It is an amenable number.

72111401 is a deficient number, since it is larger than the sum of its proper divisors (158251).

72111401 is a wasteful number, since it uses less digits than its factorization.

72111401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158250.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 72111401 is about 8491.8432039222. The cubic root of 72111401 is about 416.2312127681.

Adding to 72111401 its reverse (10411127), we get a palindrome (82522528).

The spelling of 72111401 in words is "seventy-two million, one hundred eleven thousand, four hundred one".