128568631 has 2 divisors, whose sum is σ = 128568632. Its totient is φ = 128568630.

The previous prime is 128568623. The next prime is 128568647. The reversal of 128568631 is 136865821.

It is a weak prime.

It is an emirp because it is prime and its reverse (136865821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128568631 - 2³ = 128568623 is a prime.

It is a super-2 number, since 2×128568631² = 33059785754428322, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 128568631 parts by 16035 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128568031) 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, 64284315 + 64284316.

It is an arithmetic number, because the mean of its divisors is an integer number (64284316).

Almost surely, 2^128568631 is an apocalyptic number.

128568631 is a deficient number, since it is larger than the sum of its proper divisors (1).

128568631 is an equidigital number, since it uses as much as digits as its factorization.

128568631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 128568631 is about 11338.8108283012. The cubic root of 128568631 is about 504.7135989998.

The spelling of 128568631 in words is "one hundred twenty-eight million, five hundred sixty-eight thousand, six hundred thirty-one".