2129161 has 2 divisors, whose sum is σ = 2129162. Its totient is φ = 2129160.

The previous prime is 2129123. The next prime is 2129167. The reversal of 2129161 is 1619212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2013561 + 115600 = 1419^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129161 - 2⁹ = 2128649 is a prime.

It is an Ulam number.

2129161 is a lucky number.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (2129167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064580 + 1064581.

It is an arithmetic number, because the mean of its divisors is an integer number (1064581).

2^2129161 is an apocalyptic number.

It is an amenable number.

2129161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2129161 is an equidigital number, since it uses as much as digits as its factorization.

2129161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 22.

The square root of 2129161 is about 1459.1644869582. The cubic root of 2129161 is about 128.6479393519.

The spelling of 2129161 in words is "two million, one hundred twenty-nine thousand, one hundred sixty-one".