128631143 has 2 divisors, whose sum is σ = 128631144. Its totient is φ = 128631142.

The previous prime is 128631137. The next prime is 128631149. The reversal of 128631143 is 341136821.

It is a balanced prime because it is at equal distance from previous prime (128631137) and next prime (128631149).

It is an emirp because it is prime and its reverse (341136821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128631143 - 2¹² = 128627047 is a prime.

It is equal to p_7304825 and since 128631143 and 7304825 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128631149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64315571 + 64315572.

It is an arithmetic number, because the mean of its divisors is an integer number (64315572).

Almost surely, 2^128631143 is an apocalyptic number.

128631143 is a deficient number, since it is larger than the sum of its proper divisors (1).

128631143 is an equidigital number, since it uses as much as digits as its factorization.

128631143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 128631143 is about 11341.5670434028. The cubic root of 128631143 is about 504.7953855242.

Adding to 128631143 its reverse (341136821), we get a palindrome (469767964).

The spelling of 128631143 in words is "one hundred twenty-eight million, six hundred thirty-one thousand, one hundred forty-three".