128967731 has 2 divisors, whose sum is σ = 128967732. Its totient is φ = 128967730.

The previous prime is 128967701. The next prime is 128967757. The reversal of 128967731 is 137769821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128967731 - 2⁶ = 128967667 is a prime.

It is a super-2 number, since 2×128967731² = 33265351278576722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128967701) 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, 64483865 + 64483866.

It is an arithmetic number, because the mean of its divisors is an integer number (64483866).

Almost surely, 2^128967731 is an apocalyptic number.

128967731 is a deficient number, since it is larger than the sum of its proper divisors (1).

128967731 is an equidigital number, since it uses as much as digits as its factorization.

128967731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 44.

The square root of 128967731 is about 11356.3960392371. The cubic root of 128967731 is about 505.2352999476.

The spelling of 128967731 in words is "one hundred twenty-eight million, nine hundred sixty-seven thousand, seven hundred thirty-one".