2161404187 has 2 divisors, whose sum is σ = 2161404188. Its totient is φ = 2161404186.

The previous prime is 2161404163. The next prime is 2161404209. The reversal of 2161404187 is 7814041612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2161404187 - 2⁷ = 2161404059 is a prime.

It is a super-2 number, since 2×2161404187² = 9343336119162261938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2161404127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080702093 + 1080702094.

It is an arithmetic number, because the mean of its divisors is an integer number (1080702094).

Almost surely, 2^2161404187 is an apocalyptic number.

2161404187 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161404187 is an equidigital number, since it uses as much as digits as its factorization.

2161404187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 2161404187 is about 46490.9043469795. The cubic root of 2161404187 is about 1292.9408671550.

Adding to 2161404187 its reverse (7814041612), we get a palindrome (9975445799).

The spelling of 2161404187 in words is "two billion, one hundred sixty-one million, four hundred four thousand, one hundred eighty-seven".