16021669 has 2 divisors, whose sum is σ = 16021670. Its totient is φ = 16021668.

The previous prime is 16021651. The next prime is 16021673. The reversal of 16021669 is 96612061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12460900 + 3560769 = 3530^2 + 1887^2 .

It is a cyclic number.

It is not a de Polignac number, because 16021669 - 2¹⁹ = 15497381 is a prime.

It is a super-2 number, since 2×16021669² = 513387755091122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16021669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16021609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8010834 + 8010835.

It is an arithmetic number, because the mean of its divisors is an integer number (8010835).

Almost surely, 2^16021669 is an apocalyptic number.

It is an amenable number.

16021669 is a deficient number, since it is larger than the sum of its proper divisors (1).

16021669 is an equidigital number, since it uses as much as digits as its factorization.

16021669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 16021669 is about 4002.7077085393. The cubic root of 16021669 is about 252.0979137860.

The spelling of 16021669 in words is "sixteen million, twenty-one thousand, six hundred sixty-nine".