15172315217 has 8 divisors (see below), whose sum is σ = 16032387840. Its totient is φ = 14328943200.

The previous prime is 15172315189. The next prime is 15172315253. The reversal of 15172315217 is 71251327151.

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

It is a cyclic number.

It is not a de Polignac number, because 15172315217 - 2⁶ = 15172315153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15172315517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4173284 + ... + 4176917.

It is an arithmetic number, because the mean of its divisors is an integer number (2004048480).

Almost surely, 2^15172315217 is an apocalyptic number.

It is an amenable number.

15172315217 is a deficient number, since it is larger than the sum of its proper divisors (860072623).

15172315217 is an equidigital number, since it uses as much as digits as its factorization.

15172315217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8350303.

The product of its digits is 14700, while the sum is 35.

The spelling of 15172315217 in words is "fifteen billion, one hundred seventy-two million, three hundred fifteen thousand, two hundred seventeen".