2168731 has 2 divisors, whose sum is σ = 2168732. Its totient is φ = 2168730.

The previous prime is 2168713. The next prime is 2168737. The reversal of 2168731 is 1378612.

2168731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (2168713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2168731 - 2⁹ = 2168219 is a prime.

It is a super-2 number, since 2×2168731² = 9406788300722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2168731.

It is not a weakly prime, because it can be changed into another prime (2168737) 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, 1084365 + 1084366.

It is an arithmetic number, because the mean of its divisors is an integer number (1084366).

2^2168731 is an apocalyptic number.

2168731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168731 is an equidigital number, since it uses as much as digits as its factorization.

2168731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 2168731 is about 1472.6611966097. The cubic root of 2168731 is about 129.4400173407.

The spelling of 2168731 in words is "two million, one hundred sixty-eight thousand, seven hundred thirty-one".