72171105 has 8 divisors (see below), whose sum is σ = 115473792. Its totient is φ = 38491248.

The previous prime is 72171091. The next prime is 72171109. The reversal of 72171105 is 50117127.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72171105 - 2⁴ = 72171089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72171109) 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 7 ways as a sum of consecutive naturals, for example, 2405689 + ... + 2405718.

It is an arithmetic number, because the mean of its divisors is an integer number (14434224).

Almost surely, 2^72171105 is an apocalyptic number.

It is an amenable number.

72171105 is a deficient number, since it is larger than the sum of its proper divisors (43302687).

72171105 is a wasteful number, since it uses less digits than its factorization.

72171105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4811415.

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 72171105 is about 8495.3578500261. The cubic root of 72171105 is about 416.3460527372.

The spelling of 72171105 in words is "seventy-two million, one hundred seventy-one thousand, one hundred five".