128681651 has 8 divisors (see below), whose sum is σ = 151809024. Its totient is φ = 106740360.

The previous prime is 128681639. The next prime is 128681659. The reversal of 128681651 is 156186821.

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 128681651 - 2¹⁴ = 128665267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128681659) 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, 296285 + ... + 296718.

It is an arithmetic number, because the mean of its divisors is an integer number (18976128).

Almost surely, 2^128681651 is an apocalyptic number.

128681651 is a deficient number, since it is larger than the sum of its proper divisors (23127373).

128681651 is an equidigital number, since it uses as much as digits as its factorization.

128681651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593041.

The product of its digits is 23040, while the sum is 38.

The square root of 128681651 is about 11343.7935012940. The cubic root of 128681651 is about 504.8614474653.

The spelling of 128681651 in words is "one hundred twenty-eight million, six hundred eighty-one thousand, six hundred fifty-one".