128656951 has 16 divisors (see below), whose sum is σ = 134041600. Its totient is φ = 123428448.

The previous prime is 128656949. The next prime is 128656973. The reversal of 128656951 is 159656821.

It is a cyclic number.

It is not a de Polignac number, because 128656951 - 2¹ = 128656949 is a prime.

It is a super-2 number, since 2×128656951² = 33105222081232802, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128656898 and 128656907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128656921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 576826 + ... + 577048.

It is an arithmetic number, because the mean of its divisors is an integer number (8377600).

Almost surely, 2^128656951 is an apocalyptic number.

128656951 is a deficient number, since it is larger than the sum of its proper divisors (5384649).

128656951 is a wasteful number, since it uses less digits than its factorization.

128656951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478.

The product of its digits is 129600, while the sum is 43.

The square root of 128656951 is about 11342.7047479867. The cubic root of 128656951 is about 504.8291432592.

The spelling of 128656951 in words is "one hundred twenty-eight million, six hundred fifty-six thousand, nine hundred fifty-one".