128316501 has 16 divisors (see below), whose sum is σ = 190350400. Its totient is φ = 85431024.

The previous prime is 128316499. The next prime is 128316509. The reversal of 128316501 is 105613821.

128316501 is a `hidden beast` number, since 1 + 2 + 8 + 3 + 1 + 650 + 1 = 666.

It is not a de Polignac number, because 128316501 - 2¹ = 128316499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128316509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20970 + ... + 26388.

It is an arithmetic number, because the mean of its divisors is an integer number (11896900).

Almost surely, 2^128316501 is an apocalyptic number.

It is an amenable number.

128316501 is a deficient number, since it is larger than the sum of its proper divisors (62033899).

128316501 is an equidigital number, since it uses as much as digits as its factorization.

128316501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6305 (or 6299 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 128316501 is about 11327.6873632706. The cubic root of 128316501 is about 504.3834595947.

The spelling of 128316501 in words is "one hundred twenty-eight million, three hundred sixteen thousand, five hundred one".