16516897 has 4 divisors (see below), whose sum is σ = 16526916. Its totient is φ = 16506880.

The previous prime is 16516889. The next prime is 16516919. The reversal of 16516897 is 79861561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 79861561 = 13 ⋅6143197.

It can be written as a sum of positive squares in 2 ways, for example, as 12737761 + 3779136 = 3569^2 + 1944^2 .

It is a cyclic number.

It is not a de Polignac number, because 16516897 - 2³ = 16516889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16516807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1888 + ... + 6049.

It is an arithmetic number, because the mean of its divisors is an integer number (4131729).

Almost surely, 2^16516897 is an apocalyptic number.

It is an amenable number.

16516897 is a deficient number, since it is larger than the sum of its proper divisors (10019).

16516897 is an equidigital number, since it uses as much as digits as its factorization.

16516897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10018.

The product of its digits is 90720, while the sum is 43.

The square root of 16516897 is about 4064.0985470335. The cubic root of 16516897 is about 254.6690413586.

The spelling of 16516897 in words is "sixteen million, five hundred sixteen thousand, eight hundred ninety-seven".