65531143 has 2 divisors, whose sum is σ = 65531144. Its totient is φ = 65531142.

The previous prime is 65531119. The next prime is 65531173. The reversal of 65531143 is 34113556.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65531143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65531173) 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, 32765571 + 32765572.

It is an arithmetic number, because the mean of its divisors is an integer number (32765572).

Almost surely, 2^65531143 is an apocalyptic number.

65531143 is a deficient number, since it is larger than the sum of its proper divisors (1).

65531143 is an equidigital number, since it uses as much as digits as its factorization.

65531143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 28.

The square root of 65531143 is about 8095.1308204377. The cubic root of 65531143 is about 403.1647756999.

Adding to 65531143 its reverse (34113556), we get a palindrome (99644699).

The spelling of 65531143 in words is "sixty-five million, five hundred thirty-one thousand, one hundred forty-three".