530128749 has 4 divisors (see below), whose sum is σ = 706838336. Its totient is φ = 353419164.

The previous prime is 530128741. The next prime is 530128751. The reversal of 530128749 is 947821035.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 530128749 - 2³ = 530128741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (530128741) 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 3 ways as a sum of consecutive naturals, for example, 88354789 + ... + 88354794.

It is an arithmetic number, because the mean of its divisors is an integer number (176709584).

Almost surely, 2^530128749 is an apocalyptic number.

It is an amenable number.

530128749 is a deficient number, since it is larger than the sum of its proper divisors (176709587).

530128749 is a wasteful number, since it uses less digits than its factorization.

530128749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176709586.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 530128749 is about 23024.5249462394. The cubic root of 530128749 is about 809.3327579292.

The spelling of 530128749 in words is "five hundred thirty million, one hundred twenty-eight thousand, seven hundred forty-nine".