15117145 has 4 divisors (see below), whose sum is σ = 18140580. Its totient is φ = 12093712.

The previous prime is 15117133. The next prime is 15117169. The reversal of 15117145 is 54171151.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2521744 + 12595401 = 1588^2 + 3549^2 .

It is a cyclic number.

It is not a de Polignac number, because 15117145 - 2¹⁹ = 14592857 is a prime.

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, 1511710 + ... + 1511719.

It is an arithmetic number, because the mean of its divisors is an integer number (4535145).

Almost surely, 2^15117145 is an apocalyptic number.

It is an amenable number.

15117145 is a deficient number, since it is larger than the sum of its proper divisors (3023435).

15117145 is an equidigital number, since it uses as much as digits as its factorization.

15117145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3023434.

The product of its digits is 700, while the sum is 25.

The square root of 15117145 is about 3888.0772883265. The cubic root of 15117145 is about 247.2615531602.

Adding to 15117145 its reverse (54171151), we get a palindrome (69288296).

The spelling of 15117145 in words is "fifteen million, one hundred seventeen thousand, one hundred forty-five".