16444691 has 2 divisors, whose sum is σ = 16444692. Its totient is φ = 16444690.

The previous prime is 16444679. The next prime is 16444693. The reversal of 16444691 is 19644461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16444691 is a prime.

It is a Sophie Germain prime.

Together with 16444693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16444693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8222345 + 8222346.

It is an arithmetic number, because the mean of its divisors is an integer number (8222346).

Almost surely, 2^16444691 is an apocalyptic number.

16444691 is a deficient number, since it is larger than the sum of its proper divisors (1).

16444691 is an equidigital number, since it uses as much as digits as its factorization.

16444691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 16444691 is about 4055.2054201976. The cubic root of 16444691 is about 254.2973917633.

The spelling of 16444691 in words is "sixteen million, four hundred forty-four thousand, six hundred ninety-one".