72147109 has 4 divisors (see below), whose sum is σ = 72180640. Its totient is φ = 72113580.

The previous prime is 72147107. The next prime is 72147181. The reversal of 72147109 is 90174127.

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.

It is a cyclic number.

It is not a de Polignac number, because 72147109 - 2¹ = 72147107 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 (72147107) 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, 13299 + ... + 17920.

It is an arithmetic number, because the mean of its divisors is an integer number (18045160).

Almost surely, 2^72147109 is an apocalyptic number.

It is an amenable number.

72147109 is a deficient number, since it is larger than the sum of its proper divisors (33531).

72147109 is a wasteful number, since it uses less digits than its factorization.

72147109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33530.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 72147109 is about 8493.9454318944. The cubic root of 72147109 is about 416.2999043174.

The spelling of 72147109 in words is "seventy-two million, one hundred forty-seven thousand, one hundred nine".