13231706 has 4 divisors (see below), whose sum is σ = 19847562. Its totient is φ = 6615852.

The previous prime is 13231703. The next prime is 13231711. The reversal of 13231706 is 60713231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60713231 = 3001 ⋅20231.

It can be written as a sum of positive squares in only one way, i.e., 10857025 + 2374681 = 3295^2 + 1541^2 .

It is not an unprimeable number, because it can be changed into a prime (13231703) 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, 3307925 + ... + 3307928.

Almost surely, 2^13231706 is an apocalyptic number.

13231706 is a deficient number, since it is larger than the sum of its proper divisors (6615856).

13231706 is an equidigital number, since it uses as much as digits as its factorization.

13231706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6615855.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 13231706 is about 3637.5412025158. The cubic root of 13231706 is about 236.5222204821.

Adding to 13231706 its reverse (60713231), we get a palindrome (73944937).

The spelling of 13231706 in words is "thirteen million, two hundred thirty-one thousand, seven hundred six".