13231018 has 16 divisors (see below), whose sum is σ = 20675880. Its totient is φ = 6342336.

The previous prime is 13230991. The next prime is 13231019. The reversal of 13231018 is 81013231.

It can be written as a sum of positive squares in 4 ways, for example, as 12837889 + 393129 = 3583^2 + 627^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13230986 and 13231004.

It is not an unprimeable number, because it can be changed into a prime (13231019) 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 in 7 ways as a sum of consecutive naturals, for example, 8380 + ... + 9832.

Almost surely, 2^13231018 is an apocalyptic number.

13231018 is a deficient number, since it is larger than the sum of its proper divisors (7444862).

13231018 is a wasteful number, since it uses less digits than its factorization.

13231018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 13231018 is about 3637.4466319109. The cubic root of 13231018 is about 236.5181209828.

Adding to 13231018 its reverse (81013231), we get a palindrome (94244249).

The spelling of 13231018 in words is "thirteen million, two hundred thirty-one thousand, eighteen".