128236851 has 10 divisors (see below), whose sum is σ = 191563812. Its totient is φ = 85491180.

The previous prime is 128236841. The next prime is 128236859. The reversal of 128236851 is 158632821.

It is a happy number.

It is not a de Polignac number, because 128236851 - 2¹⁴ = 128220467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128236859) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 791505 + ... + 791666.

Almost surely, 2^128236851 is an apocalyptic number.

128236851 is a deficient number, since it is larger than the sum of its proper divisors (63326961).

128236851 is an equidigital number, since it uses as much as digits as its factorization.

128236851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583183 (or 1583174 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 128236851 is about 11324.1710954930. The cubic root of 128236851 is about 504.2790758832.

The spelling of 128236851 in words is "one hundred twenty-eight million, two hundred thirty-six thousand, eight hundred fifty-one".