2166431 has 2 divisors, whose sum is σ = 2166432. Its totient is φ = 2166430.

The previous prime is 2166427. The next prime is 2166449. The reversal of 2166431 is 1346612.

It is a happy number.

2166431 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 2166431 - 2² = 2166427 is a prime.

It is a super-2 number, since 2×2166431² = 9386846555522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2166397 and 2166406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2163431) 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, 1083215 + 1083216.

It is an arithmetic number, because the mean of its divisors is an integer number (1083216).

2^2166431 is an apocalyptic number.

2166431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166431 is an equidigital number, since it uses as much as digits as its factorization.

2166431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 2166431 is about 1471.8800902247. The cubic root of 2166431 is about 129.3942429000.

The spelling of 2166431 in words is "two million, one hundred sixty-six thousand, four hundred thirty-one".