31644143 has 2 divisors, whose sum is σ = 31644144. Its totient is φ = 31644142.

The previous prime is 31644131. The next prime is 31644163. The reversal of 31644143 is 34144613.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31644143 - 2¹⁶ = 31578607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31644103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15822071 + 15822072.

It is an arithmetic number, because the mean of its divisors is an integer number (15822072).

Almost surely, 2^31644143 is an apocalyptic number.

31644143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31644143 is an equidigital number, since it uses as much as digits as its factorization.

31644143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

The square root of 31644143 is about 5625.3127024193. The cubic root of 31644143 is about 316.2989713100.

Adding to 31644143 its reverse (34144613), we get a palindrome (65788756).

The spelling of 31644143 in words is "thirty-one million, six hundred forty-four thousand, one hundred forty-three".