13128977 has 4 divisors (see below), whose sum is σ = 13308900. Its totient is φ = 12949056.

The previous prime is 13128971. The next prime is 13128991. The reversal of 13128977 is 77982131.

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 4596736 + 8532241 = 2144^2 + 2921^2 .

It is a cyclic number.

It is not a de Polignac number, because 13128977 - 2⁸ = 13128721 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 13128977.

It is not an unprimeable number, because it can be changed into a prime (13128971) 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, 89852 + ... + 89997.

It is an arithmetic number, because the mean of its divisors is an integer number (3327225).

Almost surely, 2^13128977 is an apocalyptic number.

It is an amenable number.

13128977 is a deficient number, since it is larger than the sum of its proper divisors (179923).

13128977 is an equidigital number, since it uses as much as digits as its factorization.

13128977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179922.

The product of its digits is 21168, while the sum is 38.

The square root of 13128977 is about 3623.3930231207. The cubic root of 13128977 is about 235.9085217133.

The spelling of 13128977 in words is "thirteen million, one hundred twenty-eight thousand, nine hundred seventy-seven".