128695951 has 2 divisors, whose sum is σ = 128695952. Its totient is φ = 128695950.

The previous prime is 128695913. The next prime is 128695969. The reversal of 128695951 is 159596821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128695951 - 2⁹ = 128695439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128693951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64347975 + 64347976.

It is an arithmetic number, because the mean of its divisors is an integer number (64347976).

Almost surely, 2^128695951 is an apocalyptic number.

128695951 is a deficient number, since it is larger than the sum of its proper divisors (1).

128695951 is an equidigital number, since it uses as much as digits as its factorization.

128695951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 46.

The square root of 128695951 is about 11344.4237843973. The cubic root of 128695951 is about 504.8801480110.

The spelling of 128695951 in words is "one hundred twenty-eight million, six hundred ninety-five thousand, nine hundred fifty-one".