16489691 has 2 divisors, whose sum is σ = 16489692. Its totient is φ = 16489690.

The previous prime is 16489687. The next prime is 16489723. The reversal of 16489691 is 19698461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16489691 - 2² = 16489687 is a prime.

It is not a weakly prime, because it can be changed into another prime (16489601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8244845 + 8244846.

It is an arithmetic number, because the mean of its divisors is an integer number (8244846).

Almost surely, 2^16489691 is an apocalyptic number.

16489691 is a deficient number, since it is larger than the sum of its proper divisors (1).

16489691 is an equidigital number, since it uses as much as digits as its factorization.

16489691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 16489691 is about 4060.7500538694. The cubic root of 16489691 is about 254.5291374861.

The spelling of 16489691 in words is "sixteen million, four hundred eighty-nine thousand, six hundred ninety-one".