2168657 has 2 divisors, whose sum is σ = 2168658. Its totient is φ = 2168656.

The previous prime is 2168653. The next prime is 2168659. The reversal of 2168657 is 7568612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2085136 + 83521 = 1444^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2168657 - 2² = 2168653 is a prime.

Together with 2168659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2168651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084328 + 1084329.

It is an arithmetic number, because the mean of its divisors is an integer number (1084329).

2^2168657 is an apocalyptic number.

It is an amenable number.

2168657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168657 is an equidigital number, since it uses as much as digits as its factorization.

2168657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 2168657 is about 1472.6360718114. The cubic root of 2168657 is about 129.4385451018.

The spelling of 2168657 in words is "two million, one hundred sixty-eight thousand, six hundred fifty-seven".