13231538 has 4 divisors (see below), whose sum is σ = 19847310. Its totient is φ = 6615768.

The previous prime is 13231531. The next prime is 13231553. The reversal of 13231538 is 83513231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83513231 = 17 ⋅4912543.

It can be written as a sum of positive squares in only one way, i.e., 11002489 + 2229049 = 3317^2 + 1493^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13231531) 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 as a sum of consecutive naturals, namely, 3307883 + ... + 3307886.

Almost surely, 2^13231538 is an apocalyptic number.

13231538 is a deficient number, since it is larger than the sum of its proper divisors (6615772).

13231538 is an equidigital number, since it uses as much as digits as its factorization.

13231538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6615771.

The product of its digits is 2160, while the sum is 26.

The square root of 13231538 is about 3637.5181099206. The cubic root of 13231538 is about 236.5212194547.

Adding to 13231538 its reverse (83513231), we get a palindrome (96744769).

The spelling of 13231538 in words is "thirteen million, two hundred thirty-one thousand, five hundred thirty-eight".