128906901 has 6 divisors (see below), whose sum is σ = 186198870. Its totient is φ = 85937928.

The previous prime is 128906879. The next prime is 128906909. The reversal of 128906901 is 109609821.

It can be written as a sum of positive squares in only one way, i.e., 74132100 + 54774801 = 8610^2 + 7401^2 .

It is not a de Polignac number, because 128906901 - 2⁶ = 128906837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128906909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7161486 + ... + 7161503.

It is an arithmetic number, because the mean of its divisors is an integer number (31033145).

Almost surely, 2^128906901 is an apocalyptic number.

It is an amenable number.

128906901 is a deficient number, since it is larger than the sum of its proper divisors (57291969).

128906901 is a wasteful number, since it uses less digits than its factorization.

128906901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14322995 (or 14322992 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 128906901 is about 11353.7174969258. The cubic root of 128906901 is about 505.1558529512.

It can be divided in two parts, 12890 and 6901, that added together give a palindrome (19791).

The spelling of 128906901 in words is "one hundred twenty-eight million, nine hundred six thousand, nine hundred one".