16649115 has 16 divisors (see below), whose sum is σ = 30444288. Its totient is φ = 7610976.

The previous prime is 16649107. The next prime is 16649117. The reversal of 16649115 is 51194661.

Added to its reverse (51194661) it gives a triangular number (67843776 = T₁₁₆₄₈).

It is not a de Polignac number, because 16649115 - 2³ = 16649107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16649117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79177 + ... + 79386.

It is an arithmetic number, because the mean of its divisors is an integer number (1902768).

Almost surely, 2^16649115 is an apocalyptic number.

16649115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16649115 is a deficient number, since it is larger than the sum of its proper divisors (13795173).

16649115 is a wasteful number, since it uses less digits than its factorization.

16649115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158578.

The product of its digits is 6480, while the sum is 33.

The square root of 16649115 is about 4080.3327070228. The cubic root of 16649115 is about 255.3467792519.

Adding to 16649115 its reverse (51194661), we get a triangular number (67843776 = T₁₁₆₄₈).

The spelling of 16649115 in words is "sixteen million, six hundred forty-nine thousand, one hundred fifteen".