2101669 has 2 divisors, whose sum is σ = 2101670. Its totient is φ = 2101668.

The previous prime is 2101667. The next prime is 2101681. The reversal of 2101669 is 9661012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1988100 + 113569 = 1410^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101669 - 2¹ = 2101667 is a prime.

It is a super-2 number, since 2×2101669² = 8834025171122, which contains 22 as substring.

Together with 2101667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050834 + 1050835.

It is an arithmetic number, because the mean of its divisors is an integer number (1050835).

2^2101669 is an apocalyptic number.

It is an amenable number.

2101669 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101669 is an equidigital number, since it uses as much as digits as its factorization.

2101669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 2101669 is about 1449.7134199558. The cubic root of 2101669 is about 128.0918326998.

The spelling of 2101669 in words is "two million, one hundred one thousand, six hundred sixty-nine".