7128947129 has 4 divisors (see below), whose sum is σ = 7438901376. Its totient is φ = 6818992884.

The previous prime is 7128947113. The next prime is 7128947149. The reversal of 7128947129 is 9217498217.

7128947129 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 7128947129 - 2⁴ = 7128947113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7128947149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154977089 + ... + 154977134.

It is an arithmetic number, because the mean of its divisors is an integer number (1859725344).

Almost surely, 2^7128947129 is an apocalyptic number.

It is an amenable number.

7128947129 is a deficient number, since it is larger than the sum of its proper divisors (309954247).

7128947129 is a wasteful number, since it uses less digits than its factorization.

7128947129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309954246.

The product of its digits is 508032, while the sum is 50.

The square root of 7128947129 is about 84433.0926177645. The cubic root of 7128947129 is about 1924.6058340872.

The spelling of 7128947129 in words is "seven billion, one hundred twenty-eight million, nine hundred forty-seven thousand, one hundred twenty-nine".