2154161 has 2 divisors, whose sum is σ = 2154162. Its totient is φ = 2154160.

The previous prime is 2154143. The next prime is 2154169. The reversal of 2154161 is 1614512.

2154161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2119936 + 34225 = 1456^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154161 - 2¹⁸ = 1892017 is a prime.

It is a super-2 number, since 2×2154161² = 9280819227842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2154169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077080 + 1077081.

It is an arithmetic number, because the mean of its divisors is an integer number (1077081).

2^2154161 is an apocalyptic number.

It is an amenable number.

2154161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154161 is an equidigital number, since it uses as much as digits as its factorization.

2154161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 2154161 is about 1467.7060332369. The cubic root of 2154161 is about 129.1494971744.

Adding to 2154161 its reverse (1614512), we get a palindrome (3768673).

The spelling of 2154161 in words is "two million, one hundred fifty-four thousand, one hundred sixty-one".