128701391 has 24 divisors (see below), whose sum is σ = 166813920. Its totient is φ = 98304192.

The previous prime is 128701379. The next prime is 128701427. The reversal of 128701391 is 193107821.

128701391 = T₂₉₀ + T₂₉₁ + ... + T₉₂₆.

It is a de Polignac number, because none of the positive numbers 2^k-128701391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128701291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14990 + ... + 21956.

It is an arithmetic number, because the mean of its divisors is an integer number (6950580).

Almost surely, 2^128701391 is an apocalyptic number.

128701391 is a deficient number, since it is larger than the sum of its proper divisors (38112529).

128701391 is a wasteful number, since it uses less digits than its factorization.

128701391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7023 (or 7016 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 128701391 is about 11344.6635472366. The cubic root of 128701391 is about 504.8872617010.

The spelling of 128701391 in words is "one hundred twenty-eight million, seven hundred one thousand, three hundred ninety-one".