128526981 has 16 divisors (see below), whose sum is σ = 187203648. Its totient is φ = 77788800.

The previous prime is 128526973. The next prime is 128526989. The reversal of 128526981 is 189625821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128526973) and next prime (128526989).

It is not a de Polignac number, because 128526981 - 2³ = 128526973 is a prime.

It is a super-2 number, since 2×128526981² = 33038369689948722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128526989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26721 + ... + 31161.

It is an arithmetic number, because the mean of its divisors is an integer number (11700228).

Almost surely, 2^128526981 is an apocalyptic number.

128526981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128526981 is a deficient number, since it is larger than the sum of its proper divisors (58676667).

128526981 is a wasteful number, since it uses less digits than its factorization.

128526981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5332.

The product of its digits is 69120, while the sum is 42.

The square root of 128526981 is about 11336.9740671839. The cubic root of 128526981 is about 504.6590922056.

The spelling of 128526981 in words is "one hundred twenty-eight million, five hundred twenty-six thousand, nine hundred eighty-one".