2161031 has 2 divisors, whose sum is σ = 2161032. Its totient is φ = 2161030.

The previous prime is 2161007. The next prime is 2161087. The reversal of 2161031 is 1301612.

2161031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161031 - 2⁶ = 2160967 is a prime.

It is a super-2 number, since 2×2161031² = 9340109965922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2160997 and 2161015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161001) 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, 1080515 + 1080516.

It is an arithmetic number, because the mean of its divisors is an integer number (1080516).

2^2161031 is an apocalyptic number.

2161031 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161031 is an equidigital number, since it uses as much as digits as its factorization.

2161031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 2161031 is about 1470.0445571478. The cubic root of 2161031 is about 129.2866450024.

Adding to 2161031 its reverse (1301612), we get a palindrome (3462643).

The spelling of 2161031 in words is "two million, one hundred sixty-one thousand, thirty-one".