128631337 has 2 divisors, whose sum is σ = 128631338. Its totient is φ = 128631336.

The previous prime is 128631331. The next prime is 128631353. The reversal of 128631337 is 733136821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119486761 + 9144576 = 10931^2 + 3024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128631337 is a prime.

It is not a weakly prime, because it can be changed into another prime (128631331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64315668 + 64315669.

It is an arithmetic number, because the mean of its divisors is an integer number (64315669).

Almost surely, 2^128631337 is an apocalyptic number.

It is an amenable number.

128631337 is a deficient number, since it is larger than the sum of its proper divisors (1).

128631337 is an equidigital number, since it uses as much as digits as its factorization.

128631337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 128631337 is about 11341.5755960096. The cubic root of 128631337 is about 504.7956392996.

It can be divided in two parts, 1286 and 31337, that added together give a palindrome (32623).

The spelling of 128631337 in words is "one hundred twenty-eight million, six hundred thirty-one thousand, three hundred thirty-seven".