128147532529 has 3 divisors (see below), whose sum is σ = 128147890507. Its totient is φ = 128147174552.

The previous prime is 128147532473. The next prime is 128147532547. The reversal of 128147532529 is 925235741821.

The square root of 128147532529 is 357977.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 925235741821 = 373 ⋅2480524777.

It can be written as a sum of positive squares in only one way, i.e., 67753487025 + 60394045504 = 260295^2 + 245752^2 .

It is a de Polignac number, because none of the positive numbers 2^k-128147532529 is a prime.

It is a super-2 number, since 2×128147532529² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128147572529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 178989 + ... + 536965.

Almost surely, 2^128147532529 is an apocalyptic number.

128147532529 is the 357977-th square number.

128147532529 is the 178989-th centered octagonal number.

It is an amenable number.

128147532529 is a deficient number, since it is larger than the sum of its proper divisors (357978).

128147532529 is an frugal number, since it uses more digits than its factorization.

128147532529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715954 (or 357977 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 49.

Multiplying 128147532529 by its sum of digits (49), we get a square (6279229093921 = 2505839²).

The spelling of 128147532529 in words is "one hundred twenty-eight billion, one hundred forty-seven million, five hundred thirty-two thousand, five hundred twenty-nine".