9138515 has 4 divisors (see below), whose sum is σ = 10966224. Its totient is φ = 7310808.

The previous prime is 9138511. The next prime is 9138517. The reversal of 9138515 is 5158319.

9138515 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, and also an emirpimes, since its reverse is a distinct semiprime: 5158319 = 181 ⋅28499.

It is a cyclic number.

It is not a de Polignac number, because 9138515 - 2² = 9138511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9138511) 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, 913847 + ... + 913856.

It is an arithmetic number, because the mean of its divisors is an integer number (2741556).

Almost surely, 2^9138515 is an apocalyptic number.

9138515 is a deficient number, since it is larger than the sum of its proper divisors (1827709).

9138515 is a wasteful number, since it uses less digits than its factorization.

9138515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827708.

The product of its digits is 5400, while the sum is 32.

The square root of 9138515 is about 3022.9976844186. The cubic root of 9138515 is about 209.0700756295.

The spelling of 9138515 in words is "nine million, one hundred thirty-eight thousand, five hundred fifteen".