16491136 has 16 divisors (see below), whose sum is σ = 32853690. Its totient is φ = 8245504.

The previous prime is 16491133. The next prime is 16491151. The reversal of 16491136 is 63119461.

It can be written as a sum of positive squares in only one way, i.e., 16451136 + 40000 = 4056^2 + 200^2 .

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

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 16491098 and 16491107.

It is not an unprimeable number, because it can be changed into a prime (16491133) 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 as a sum of consecutive naturals, namely, 64291 + ... + 64546.

Almost surely, 2^16491136 is an apocalyptic number.

16491136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16491136 is a deficient number, since it is larger than the sum of its proper divisors (16362554).

16491136 is an equidigital number, since it uses as much as digits as its factorization.

16491136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128851 (or 128839 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 16491136 is about 4060.9279727668. The cubic root of 16491136 is about 254.5365721081.

The spelling of 16491136 in words is "sixteen million, four hundred ninety-one thousand, one hundred thirty-six".