2107661 has 2 divisors, whose sum is σ = 2107662. Its totient is φ = 2107660.

The previous prime is 2107627. The next prime is 2107663. The reversal of 2107661 is 1667012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1932100 + 175561 = 1390^2 + 419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2107661 is a prime.

Together with 2107663, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2107663) 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, 1053830 + 1053831.

It is an arithmetic number, because the mean of its divisors is an integer number (1053831).

2^2107661 is an apocalyptic number.

It is an amenable number.

2107661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2107661 is an equidigital number, since it uses as much as digits as its factorization.

2107661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 2107661 is about 1451.7785643823. The cubic root of 2107661 is about 128.2134500099.

The spelling of 2107661 in words is "two million, one hundred seven thousand, six hundred sixty-one".