16722191 has 2 divisors, whose sum is σ = 16722192. Its totient is φ = 16722190.

The previous prime is 16722179. The next prime is 16722229. The reversal of 16722191 is 19122761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16722191 - 2¹⁰ = 16721167 is a prime.

It is equal to p_1074539 and since 16722191 and 1074539 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16722151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8361095 + 8361096.

It is an arithmetic number, because the mean of its divisors is an integer number (8361096).

Almost surely, 2^16722191 is an apocalyptic number.

16722191 is a deficient number, since it is larger than the sum of its proper divisors (1).

16722191 is an equidigital number, since it uses as much as digits as its factorization.

16722191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 29.

The square root of 16722191 is about 4089.2775645583. The cubic root of 16722191 is about 255.7198218493.

The spelling of 16722191 in words is "sixteen million, seven hundred twenty-two thousand, one hundred ninety-one".