128412981 has 12 divisors (see below), whose sum is σ = 185822208. Its totient is φ = 85453224.

The previous prime is 128412961. The next prime is 128412983. The reversal of 128412981 is 189214821.

It is a happy number.

It is not a de Polignac number, because 128412981 - 2¹³ = 128404789 is a prime.

It is a super-2 number, since 2×128412981² = 32979787378612722, which contains 22 as substring.

It is a Curzon number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128412983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7605 + ... + 17738.

It is an arithmetic number, because the mean of its divisors is an integer number (15485184).

Almost surely, 2^128412981 is an apocalyptic number.

It is an amenable number.

128412981 is a deficient number, since it is larger than the sum of its proper divisors (57409227).

128412981 is a wasteful number, since it uses less digits than its factorization.

128412981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25912 (or 25909 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 128412981 is about 11331.9451551797. The cubic root of 128412981 is about 504.5098416903.

The spelling of 128412981 in words is "one hundred twenty-eight million, four hundred twelve thousand, nine hundred eighty-one".