2181149 has 2 divisors, whose sum is σ = 2181150. Its totient is φ = 2181148.

The previous prime is 2181139. The next prime is 2181161. The reversal of 2181149 is 9411812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1249924 + 931225 = 1118^2 + 965^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181149 - 2¹² = 2177053 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090574 + 1090575.

It is an arithmetic number, because the mean of its divisors is an integer number (1090575).

2^2181149 is an apocalyptic number.

It is an amenable number.

2181149 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181149 is an equidigital number, since it uses as much as digits as its factorization.

2181149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 26.

The square root of 2181149 is about 1476.8713552642. The cubic root of 2181149 is about 129.6866020841.

The spelling of 2181149 in words is "two million, one hundred eighty-one thousand, one hundred forty-nine".