2221669 has 2 divisors, whose sum is σ = 2221670. Its totient is φ = 2221668.

The previous prime is 2221657. The next prime is 2221673. The reversal of 2221669 is 9661222.

2221669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1677025 + 544644 = 1295^2 + 738^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221669 - 2¹¹ = 2219621 is a prime.

It is a super-2 number, since 2×2221669² = 9871626291122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110834 + 1110835.

It is an arithmetic number, because the mean of its divisors is an integer number (1110835).

2^2221669 is an apocalyptic number.

It is an amenable number.

2221669 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221669 is an equidigital number, since it uses as much as digits as its factorization.

2221669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 2221669 is about 1490.5264170755. The cubic root of 2221669 is about 130.4847581813.

It can be divided in two parts, 222 and 1669, that added together give a triangular number (1891 = T₆₁).

The spelling of 2221669 in words is "two million, two hundred twenty-one thousand, six hundred sixty-nine".