13112731 has 4 divisors (see below), whose sum is σ = 13129200. Its totient is φ = 13096264.

The previous prime is 13112713. The next prime is 13112741. The reversal of 13112731 is 13721131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13721131 = 67 ⋅204793.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13112731 is a prime.

It is a super-2 number, since 2×13112731² = 343887428556722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13112699 and 13112708.

It is not an unprimeable number, because it can be changed into a prime (13112711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6976 + ... + 8653.

It is an arithmetic number, because the mean of its divisors is an integer number (3282300).

Almost surely, 2^13112731 is an apocalyptic number.

13112731 is a deficient number, since it is larger than the sum of its proper divisors (16469).

13112731 is an equidigital number, since it uses as much as digits as its factorization.

13112731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16468.

The product of its digits is 126, while the sum is 19.

The square root of 13112731 is about 3621.1505077806. The cubic root of 13112731 is about 235.8111759272.

Adding to 13112731 its reverse (13721131), we get a palindrome (26833862).

Subtracting 13112731 from its reverse (13721131), we obtain a square (608400 = 780²).

The spelling of 13112731 in words is "thirteen million, one hundred twelve thousand, seven hundred thirty-one".