16991441 has 6 divisors (see below), whose sum is σ = 17558226. Its totient is φ = 16442400.

The previous prime is 16991437. The next prime is 16991467. The reversal of 16991441 is 14419961.

It can be written as a sum of positive squares in only one way, i.e., 12931216 + 4060225 = 3596^2 + 2015^2 .

It is not a de Polignac number, because 16991441 - 2² = 16991437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16991341) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7880 + ... + 9801.

It is an arithmetic number, because the mean of its divisors is an integer number (2926371).

Almost surely, 2^16991441 is an apocalyptic number.

It is an amenable number.

16991441 is a deficient number, since it is larger than the sum of its proper divisors (566785).

16991441 is an equidigital number, since it uses as much as digits as its factorization.

16991441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17743 (or 17712 counting only the distinct ones).

The product of its digits is 7776, while the sum is 35.

The square root of 16991441 is about 4122.0675637355. The cubic root of 16991441 is about 257.0849996667.

The spelling of 16991441 in words is "sixteen million, nine hundred ninety-one thousand, four hundred forty-one".