16515 has 12 divisors (see below), whose sum is σ = 28704. Its totient is φ = 8784.

The previous prime is 16493. The next prime is 16519. The reversal of 16515 is 51561.

It is not a de Polignac number, because 16515 - 2⁶ = 16451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139 + ... + 228.

It is an arithmetic number, because the mean of its divisors is an integer number (2392).

2¹⁶⁵¹⁵ is an apocalyptic number.

16515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16515 is a deficient number, since it is larger than the sum of its proper divisors (12189).

16515 is a wasteful number, since it uses less digits than its factorization.

16515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 375 counting only the distinct ones).

The product of its digits is 150, while the sum is 18.

The square root of 16515 is about 128.5106999436. The cubic root of 16515 is about 25.4659291229.

The spelling of 16515 in words is "sixteen thousand, five hundred fifteen".