128957951 has 2 divisors, whose sum is σ = 128957952. Its totient is φ = 128957950.

The previous prime is 128957929. The next prime is 128957953. The reversal of 128957951 is 159759821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128957951 - 2⁶ = 128957887 is a prime.

It is a super-2 number, since 2×128957951² = 33260306252236802, which contains 22 as substring.

Together with 128957953, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 128957896 and 128957905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128957953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64478975 + 64478976.

It is an arithmetic number, because the mean of its divisors is an integer number (64478976).

Almost surely, 2^128957951 is an apocalyptic number.

128957951 is a deficient number, since it is larger than the sum of its proper divisors (1).

128957951 is an equidigital number, since it uses as much as digits as its factorization.

128957951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 47.

The square root of 128957951 is about 11355.9654367209. The cubic root of 128957951 is about 505.2225284682. Note that the first 3 decimals are identical.

The spelling of 128957951 in words is "one hundred twenty-eight million, nine hundred fifty-seven thousand, nine hundred fifty-one".