128465851 has 4 divisors (see below), whose sum is σ = 128508552. Its totient is φ = 128423152.

The previous prime is 128465807. The next prime is 128465917. The reversal of 128465851 is 158564821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128465851 - 2⁷ = 128465723 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128465801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16465 + ... + 22978.

It is an arithmetic number, because the mean of its divisors is an integer number (32127138).

Almost surely, 2^128465851 is an apocalyptic number.

128465851 is a deficient number, since it is larger than the sum of its proper divisors (42701).

128465851 is an equidigital number, since it uses as much as digits as its factorization.

128465851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42700.

The product of its digits is 76800, while the sum is 40.

The square root of 128465851 is about 11334.2777008506. The cubic root of 128465851 is about 504.5790708687.

The spelling of 128465851 in words is "one hundred twenty-eight million, four hundred sixty-five thousand, eight hundred fifty-one".