16516117 has 4 divisors (see below), whose sum is σ = 16572780. Its totient is φ = 16459456.

The previous prime is 16516099. The next prime is 16516121. The reversal of 16516117 is 71161561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71161561 = 449 ⋅158489.

It can be written as a sum of positive squares in 2 ways, for example, as 8444836 + 8071281 = 2906^2 + 2841^2 .

It is a cyclic number.

It is not a de Polignac number, because 16516117 - 2¹⁵ = 16483349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16516127) 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, 27892 + ... + 28477.

It is an arithmetic number, because the mean of its divisors is an integer number (4143195).

Almost surely, 2^16516117 is an apocalyptic number.

It is an amenable number.

16516117 is a deficient number, since it is larger than the sum of its proper divisors (56663).

16516117 is an equidigital number, since it uses as much as digits as its factorization.

16516117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56662.

The product of its digits is 1260, while the sum is 28.

The square root of 16516117 is about 4064.0025836606. The cubic root of 16516117 is about 254.6650324341.

Adding to 16516117 its reverse (71161561), we get a palindrome (87677678).

The spelling of 16516117 in words is "sixteen million, five hundred sixteen thousand, one hundred seventeen".