13172015 has 4 divisors (see below), whose sum is σ = 15806424. Its totient is φ = 10537608.

The previous prime is 13171987. The next prime is 13172023. The reversal of 13172015 is 51027131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51027131 = 1327 ⋅38453.

It is a cyclic number.

It is not a de Polignac number, because 13172015 - 2¹⁰ = 13170991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1317197 + ... + 1317206.

It is an arithmetic number, because the mean of its divisors is an integer number (3951606).

Almost surely, 2^13172015 is an apocalyptic number.

13172015 is a deficient number, since it is larger than the sum of its proper divisors (2634409).

13172015 is an equidigital number, since it uses as much as digits as its factorization.

13172015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634408.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 13172015 is about 3629.3270726128. The cubic root of 13172015 is about 236.1660171989.

Adding to 13172015 its reverse (51027131), we get a palindrome (64199146).

The spelling of 13172015 in words is "thirteen million, one hundred seventy-two thousand, fifteen".