128551401 has 16 divisors (see below), whose sum is σ = 207760320. Its totient is φ = 77909760.

The previous prime is 128551391. The next prime is 128551421. The reversal of 128551401 is 104155821.

It is not a de Polignac number, because 128551401 - 2⁵ = 128551369 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128551421) 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, 216120 + ... + 216713.

It is an arithmetic number, because the mean of its divisors is an integer number (12985020).

Almost surely, 2^128551401 is an apocalyptic number.

128551401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128551401 is a deficient number, since it is larger than the sum of its proper divisors (79208919).

128551401 is a wasteful number, since it uses less digits than its factorization.

128551401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432853 (or 432847 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 128551401 is about 11338.0510229933. The cubic root of 128551401 is about 504.6910517586.

The spelling of 128551401 in words is "one hundred twenty-eight million, five hundred fifty-one thousand, four hundred one".