13138237591 has 4 divisors (see below), whose sum is σ = 13829723800. Its totient is φ = 12446751384.

The previous prime is 13138237573. The next prime is 13138237597. The reversal of 13138237591 is 19573283131.

13138237591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19573283131 = 233 ⋅84005507.

It is a cyclic number.

It is not a de Polignac number, because 13138237591 - 2¹¹ = 13138235543 is a prime.

It is a super-2 number, since 2×13138237591² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13138237597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345743076 + ... + 345743113.

It is an arithmetic number, because the mean of its divisors is an integer number (3457430950).

Almost surely, 2^13138237591 is an apocalyptic number.

13138237591 is a deficient number, since it is larger than the sum of its proper divisors (691486209).

13138237591 is an equidigital number, since it uses as much as digits as its factorization.

13138237591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691486208.

The product of its digits is 136080, while the sum is 43.

The spelling of 13138237591 in words is "thirteen billion, one hundred thirty-eight million, two hundred thirty-seven thousand, five hundred ninety-one".