128531743 has 4 divisors (see below), whose sum is σ = 129779728. Its totient is φ = 127283760.

The previous prime is 128531729. The next prime is 128531749. The reversal of 128531743 is 347135821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 347135821 = 10253 ⋅33857.

It is a cyclic number.

It is not a de Polignac number, because 128531743 - 2⁹ = 128531231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128531699 and 128531708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128531749) 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 3 ways as a sum of consecutive naturals, for example, 623838 + ... + 624043.

It is an arithmetic number, because the mean of its divisors is an integer number (32444932).

Almost surely, 2^128531743 is an apocalyptic number.

128531743 is a deficient number, since it is larger than the sum of its proper divisors (1247985).

128531743 is a wasteful number, since it uses less digits than its factorization.

128531743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247984.

The product of its digits is 20160, while the sum is 34.

The square root of 128531743 is about 11337.1840860065. The cubic root of 128531743 is about 504.6653247670.

The spelling of 128531743 in words is "one hundred twenty-eight million, five hundred thirty-one thousand, seven hundred forty-three".