2161129 has 2 divisors, whose sum is σ = 2161130. Its totient is φ = 2161128.

The previous prime is 2161127. The next prime is 2161141. The reversal of 2161129 is 9211612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 522729 = 1280^2 + 723^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161129 - 2¹ = 2161127 is a prime.

Together with 2161127, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2161121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080564 + 1080565.

It is an arithmetic number, because the mean of its divisors is an integer number (1080565).

2^2161129 is an apocalyptic number.

It is an amenable number.

2161129 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161129 is an equidigital number, since it uses as much as digits as its factorization.

2161129 is an evil number, because the sum of its binary digits is even.

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

The square root of 2161129 is about 1470.0778890930. The cubic root of 2161129 is about 129.2885993010.

The spelling of 2161129 in words is "two million, one hundred sixty-one thousand, one hundred twenty-nine".