128986901 has 4 divisors (see below), whose sum is σ = 130128492. Its totient is φ = 127845312.

The previous prime is 128986889. The next prime is 128986903. The reversal of 128986901 is 109689821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18190225 + 110796676 = 4265^2 + 10526^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128986901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128986903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570626 + ... + 570851.

It is an arithmetic number, because the mean of its divisors is an integer number (32532123).

Almost surely, 2^128986901 is an apocalyptic number.

It is an amenable number.

128986901 is a deficient number, since it is larger than the sum of its proper divisors (1141591).

128986901 is a wasteful number, since it uses less digits than its factorization.

128986901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141590.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 128986901 is about 11357.2400256400. The cubic root of 128986901 is about 505.2603317411.

The spelling of 128986901 in words is "one hundred twenty-eight million, nine hundred eighty-six thousand, nine hundred one".