13128085 has 4 divisors (see below), whose sum is σ = 15753708. Its totient is φ = 10502464.

The previous prime is 13128079. The next prime is 13128103. The reversal of 13128085 is 58082131.

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 9690769 + 3437316 = 3113^2 + 1854^2 .

It is a cyclic number.

It is not a de Polignac number, because 13128085 - 2¹⁷ = 12997013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1312804 + ... + 1312813.

It is an arithmetic number, because the mean of its divisors is an integer number (3938427).

Almost surely, 2^13128085 is an apocalyptic number.

It is an amenable number.

13128085 is a deficient number, since it is larger than the sum of its proper divisors (2625623).

13128085 is an equidigital number, since it uses as much as digits as its factorization.

13128085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625622.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 13128085 is about 3623.2699319813. The cubic root of 13128085 is about 235.9031789470.

The spelling of 13128085 in words is "thirteen million, one hundred twenty-eight thousand, eighty-five".