128863951 has 4 divisors (see below), whose sum is σ = 129354192. Its totient is φ = 128373712.

The previous prime is 128863939. The next prime is 128864003. The reversal of 128863951 is 159368821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 159368821 = 2027 ⋅78623.

It is a cyclic number.

It is not a de Polignac number, because 128863951 - 2⁵ = 128863919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128863898 and 128863907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128863921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244726 + ... + 245251.

It is an arithmetic number, because the mean of its divisors is an integer number (32338548).

Almost surely, 2^128863951 is an apocalyptic number.

128863951 is a deficient number, since it is larger than the sum of its proper divisors (490241).

128863951 is an equidigital number, since it uses as much as digits as its factorization.

128863951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490240.

The product of its digits is 103680, while the sum is 43.

The square root of 128863951 is about 11351.8258883758. The cubic root of 128863951 is about 505.0997430667.

The spelling of 128863951 in words is "one hundred twenty-eight million, eight hundred sixty-three thousand, nine hundred fifty-one".