16330991 has 2 divisors, whose sum is σ = 16330992. Its totient is φ = 16330990.

The previous prime is 16330969. The next prime is 16331009. The reversal of 16330991 is 19903361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16330991 - 2¹⁰ = 16329967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16330091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8165495 + 8165496.

It is an arithmetic number, because the mean of its divisors is an integer number (8165496).

Almost surely, 2^16330991 is an apocalyptic number.

16330991 is a deficient number, since it is larger than the sum of its proper divisors (1).

16330991 is an equidigital number, since it uses as much as digits as its factorization.

16330991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 16330991 is about 4041.1620853413. The cubic root of 16330991 is about 253.7099578480.

The spelling of 16330991 in words is "sixteen million, three hundred thirty thousand, nine hundred ninety-one".