15172147 has 4 divisors (see below), whose sum is σ = 15213856. Its totient is φ = 15130440.

The previous prime is 15172099. The next prime is 15172153. The reversal of 15172147 is 74127151.

15172147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15172147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15172447) 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, 20304 + ... + 21037.

It is an arithmetic number, because the mean of its divisors is an integer number (3803464).

Almost surely, 2^15172147 is an apocalyptic number.

15172147 is a deficient number, since it is larger than the sum of its proper divisors (41709).

15172147 is an equidigital number, since it uses as much as digits as its factorization.

15172147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41708.

The product of its digits is 1960, while the sum is 28.

The square root of 15172147 is about 3895.1440281458. The cubic root of 15172147 is about 247.5610678137.

Adding to 15172147 its reverse (74127151), we get a palindrome (89299298).

The spelling of 15172147 in words is "fifteen million, one hundred seventy-two thousand, one hundred forty-seven".