72115189 has 4 divisors (see below), whose sum is σ = 75250656. Its totient is φ = 68979724.

The previous prime is 72115181. The next prime is 72115193. The reversal of 72115189 is 98151127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98151127 = 257 ⋅381911.

It is a cyclic number.

It is not a de Polignac number, because 72115189 - 2³ = 72115181 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 (72115181) 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, 1567699 + ... + 1567744.

It is an arithmetic number, because the mean of its divisors is an integer number (18812664).

Almost surely, 2^72115189 is an apocalyptic number.

It is an amenable number.

72115189 is a deficient number, since it is larger than the sum of its proper divisors (3135467).

72115189 is a wasteful number, since it uses less digits than its factorization.

72115189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3135466.

The product of its digits is 5040, while the sum is 34.

The square root of 72115189 is about 8492.0662385547. The cubic root of 72115189 is about 416.2385008261.

The spelling of 72115189 in words is "seventy-two million, one hundred fifteen thousand, one hundred eighty-nine".