16441991 has 2 divisors, whose sum is σ = 16441992. Its totient is φ = 16441990.

The previous prime is 16441961. The next prime is 16442029. The reversal of 16441991 is 19914461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16441991 is a prime.

It is a super-3 number, since 3×16441991³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16441921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8220995 + 8220996.

It is an arithmetic number, because the mean of its divisors is an integer number (8220996).

Almost surely, 2^16441991 is an apocalyptic number.

16441991 is a deficient number, since it is larger than the sum of its proper divisors (1).

16441991 is an equidigital number, since it uses as much as digits as its factorization.

16441991 is an evil number, because the sum of its binary digits is even.

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

The square root of 16441991 is about 4054.8725010782. The cubic root of 16441991 is about 254.2834735827.

The spelling of 16441991 in words is "sixteen million, four hundred forty-one thousand, nine hundred ninety-one".