13128811237 has 4 divisors (see below), whose sum is σ = 13276326060. Its totient is φ = 12981296416.

The previous prime is 13128811231. The next prime is 13128811279. The reversal of 13128811237 is 73211882131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73211882131 = 109673 ⋅667547.

It can be written as a sum of positive squares in 2 ways, for example, as 739785601 + 12389025636 = 27199^2 + 111306^2 .

It is a cyclic number.

It is not a de Polignac number, because 13128811237 - 2¹¹ = 13128809189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13128811196 and 13128811205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13128811231) 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, 73757278 + ... + 73757455.

It is an arithmetic number, because the mean of its divisors is an integer number (3319081515).

Almost surely, 2^13128811237 is an apocalyptic number.

It is an amenable number.

13128811237 is a deficient number, since it is larger than the sum of its proper divisors (147514823).

13128811237 is an equidigital number, since it uses as much as digits as its factorization.

13128811237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147514822.

The product of its digits is 16128, while the sum is 37.

The spelling of 13128811237 in words is "thirteen billion, one hundred twenty-eight million, eight hundred eleven thousand, two hundred thirty-seven".