3128513 has 4 divisors (see below), whose sum is σ = 3133908. Its totient is φ = 3123120.

The previous prime is 3128501. The next prime is 3128533. The reversal of 3128513 is 3158213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1507984 + 1620529 = 1228^2 + 1273^2 .

It is a cyclic number.

It is not a de Polignac number, because 3128513 - 2¹⁰ = 3127489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3128533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1706 + ... + 3027.

It is an arithmetic number, because the mean of its divisors is an integer number (783477).

Almost surely, 2^3128513 is an apocalyptic number.

It is an amenable number.

3128513 is a deficient number, since it is larger than the sum of its proper divisors (5395).

3128513 is an equidigital number, since it uses as much as digits as its factorization.

3128513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5394.

The product of its digits is 720, while the sum is 23.

The square root of 3128513 is about 1768.7603003234. The cubic root of 3128513 is about 146.2556507910.

The spelling of 3128513 in words is "three million, one hundred twenty-eight thousand, five hundred thirteen".