2167661 has 2 divisors, whose sum is σ = 2167662. Its totient is φ = 2167660.

The previous prime is 2167643. The next prime is 2167703. The reversal of 2167661 is 1667612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155625 + 1012036 = 1075^2 + 1006^2 .

It is a cyclic number.

It is not a de Polignac number, because 2167661 - 2¹⁸ = 1905517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2167621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083830 + 1083831.

It is an arithmetic number, because the mean of its divisors is an integer number (1083831).

2^2167661 is an apocalyptic number.

It is an amenable number.

2167661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2167661 is an equidigital number, since it uses as much as digits as its factorization.

2167661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 2167661 is about 1472.2978638849. The cubic root of 2167661 is about 129.4187263027.

The spelling of 2167661 in words is "two million, one hundred sixty-seven thousand, six hundred sixty-one".