5128135321 has 9 divisors (see below), whose sum is σ = 5413678911. Its totient is φ = 4856944464.

The previous prime is 5128135307. The next prime is 5128135333. The reversal of 5128135321 is 1235318215.

The square root of 5128135321 is 71611.

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

It can be written as a sum of positive squares in only one way, i.e., 4249605721 + 878529600 = 65189^2 + 29640^2 .

It is not a de Polignac number, because 5128135321 - 2⁷ = 5128135193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5128135421) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1358725 + ... + 1362493.

It is an arithmetic number, because the mean of its divisors is an integer number (601519879).

Almost surely, 2^5128135321 is an apocalyptic number.

5128135321 is the 71611-st square number.

5128135321 is the 35806-th centered octagonal number.

It is an amenable number.

5128135321 is a deficient number, since it is larger than the sum of its proper divisors (285543590).

5128135321 is an frugal number, since it uses more digits than its factorization.

5128135321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7576 (or 3788 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The cubic root of 5128135321 is about 1724.4601344680.

The spelling of 5128135321 in words is "five billion, one hundred twenty-eight million, one hundred thirty-five thousand, three hundred twenty-one".