15120115 has 4 divisors (see below), whose sum is σ = 18144144. Its totient is φ = 12096088.

The previous prime is 15120113. The next prime is 15120137. The reversal of 15120115 is 51102151.

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

It is a cyclic number.

It is not a de Polignac number, because 15120115 - 2¹ = 15120113 is a prime.

It is a super-2 number, since 2×15120115² = 457235755226450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15120113) 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, 1512007 + ... + 1512016.

It is an arithmetic number, because the mean of its divisors is an integer number (4536036).

Almost surely, 2^15120115 is an apocalyptic number.

15120115 is a deficient number, since it is larger than the sum of its proper divisors (3024029).

15120115 is an equidigital number, since it uses as much as digits as its factorization.

15120115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3024028.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 15120115 is about 3888.4592064210. The cubic root of 15120115 is about 247.2777449020.

Adding to 15120115 its reverse (51102151), we get a palindrome (66222266).

The spelling of 15120115 in words is "fifteen million, one hundred twenty thousand, one hundred fifteen".