72135559 has 4 divisors (see below), whose sum is σ = 72534280. Its totient is φ = 71736840.

The previous prime is 72135551. The next prime is 72135577. The reversal of 72135559 is 95553127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95553127 = 797 ⋅119891.

It is a cyclic number.

It is not a de Polignac number, because 72135559 - 2³ = 72135551 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 (72135551) 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 3 ways as a sum of consecutive naturals, for example, 199089 + ... + 199450.

It is an arithmetic number, because the mean of its divisors is an integer number (18133570).

Almost surely, 2^72135559 is an apocalyptic number.

72135559 is a deficient number, since it is larger than the sum of its proper divisors (398721).

72135559 is a wasteful number, since it uses less digits than its factorization.

72135559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398720.

The product of its digits is 47250, while the sum is 37.

The square root of 72135559 is about 8493.2655086251. The cubic root of 72135559 is about 416.2776880403.

The spelling of 72135559 in words is "seventy-two million, one hundred thirty-five thousand, five hundred fifty-nine".