8191616 has 16 divisors (see below), whose sum is σ = 16319490. Its totient is φ = 4095744.

The previous prime is 8191613. The next prime is 8191633. The reversal of 8191616 is 6161918.

It can be written as a sum of positive squares in only one way, i.e., 5953600 + 2238016 = 2440^2 + 1496^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (8191613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31871 + ... + 32126.

Almost surely, 2^8191616 is an apocalyptic number.

It is an amenable number.

8191616 is a deficient number, since it is larger than the sum of its proper divisors (8127874).

8191616 is an equidigital number, since it uses as much as digits as its factorization.

8191616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64011 (or 63999 counting only the distinct ones).

The product of its digits is 2592, while the sum is 32.

The square root of 8191616 is about 2862.0999283743. The cubic root of 8191616 is about 201.5842181313.

The spelling of 8191616 in words is "eight million, one hundred ninety-one thousand, six hundred sixteen".