128123851 has 8 divisors (see below), whose sum is σ = 130621104. Its totient is φ = 125639520.

The previous prime is 128123839. The next prime is 128123861. The reversal of 128123851 is 158321821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128123851 - 2⁵ = 128123819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128123861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18141 + ... + 24193.

It is an arithmetic number, because the mean of its divisors is an integer number (16327638).

Almost surely, 2^128123851 is an apocalyptic number.

128123851 is a deficient number, since it is larger than the sum of its proper divisors (2497253).

128123851 is an equidigital number, since it uses as much as digits as its factorization.

128123851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6461.

The product of its digits is 3840, while the sum is 31.

The square root of 128123851 is about 11319.1806682286. The cubic root of 128123851 is about 504.1309118130.

The spelling of 128123851 in words is "one hundred twenty-eight million, one hundred twenty-three thousand, eight hundred fifty-one".