128102481 has 24 divisors (see below), whose sum is σ = 199832360. Its totient is φ = 78610176.

The previous prime is 128102467. The next prime is 128102543. The reversal of 128102481 is 184201821.

It can be written as a sum of positive squares in 4 ways, for example, as 1742400 + 126360081 = 1320^2 + 11241^2 .

It is not a de Polignac number, because 128102481 - 2⁷ = 128102353 is a prime.

It is a super-2 number, since 2×128102481² = 32820491276710722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128102281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46515 + ... + 49191.

Almost surely, 2^128102481 is an apocalyptic number.

It is an amenable number.

128102481 is a deficient number, since it is larger than the sum of its proper divisors (71729879).

128102481 is a wasteful number, since it uses less digits than its factorization.

128102481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3105 (or 3102 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 128102481 is about 11318.2366559460. The cubic root of 128102481 is about 504.1028819639.

The spelling of 128102481 in words is "one hundred twenty-eight million, one hundred two thousand, four hundred eighty-one".