128568031 has 2 divisors, whose sum is σ = 128568032. Its totient is φ = 128568030.

The previous prime is 128568029. The next prime is 128568071. The reversal of 128568031 is 130865821.

It is a weak prime.

It is an emirp because it is prime and its reverse (130865821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128568031 - 2¹ = 128568029 is a prime.

It is a super-2 number, since 2×128568031² = 33059477190433922, which contains 22 as substring.

Together with 128568029, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128568071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64284015 + 64284016.

It is an arithmetic number, because the mean of its divisors is an integer number (64284016).

Almost surely, 2^128568031 is an apocalyptic number.

128568031 is a deficient number, since it is larger than the sum of its proper divisors (1).

128568031 is an equidigital number, since it uses as much as digits as its factorization.

128568031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 128568031 is about 11338.7843704693. The cubic root of 128568031 is about 504.7128138715.

The spelling of 128568031 in words is "one hundred twenty-eight million, five hundred sixty-eight thousand, thirty-one".