16220891 has 2 divisors, whose sum is σ = 16220892. Its totient is φ = 16220890.

The previous prime is 16220881. The next prime is 16220899. The reversal of 16220891 is 19802261.

It is a strong prime.

It is an emirp because it is prime and its reverse (19802261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16220891 - 2²² = 12026587 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16220899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8110445 + 8110446.

It is an arithmetic number, because the mean of its divisors is an integer number (8110446).

Almost surely, 2^16220891 is an apocalyptic number.

16220891 is a deficient number, since it is larger than the sum of its proper divisors (1).

16220891 is an equidigital number, since it uses as much as digits as its factorization.

16220891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 16220891 is about 4027.5167287052. The cubic root of 16220891 is about 253.1385192393.

The spelling of 16220891 in words is "sixteen million, two hundred twenty thousand, eight hundred ninety-one".