13006731 has 4 divisors (see below), whose sum is σ = 17342312. Its totient is φ = 8671152.

The previous prime is 13006723. The next prime is 13006739. The reversal of 13006731 is 13760031.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (13006723) and next prime (13006739).

It is not a de Polignac number, because 13006731 - 2³ = 13006723 is a prime.

It is a super-2 number, since 2×13006731² = 338350102612722, 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 = 13006698 and 13006707.

It is not an unprimeable number, because it can be changed into a prime (13006739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2167786 + ... + 2167791.

It is an arithmetic number, because the mean of its divisors is an integer number (4335578).

Almost surely, 2^13006731 is an apocalyptic number.

13006731 is a deficient number, since it is larger than the sum of its proper divisors (4335581).

13006731 is an equidigital number, since it uses as much as digits as its factorization.

13006731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335580.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 13006731 is about 3606.4845764262. The cubic root of 13006731 is about 235.1740433952.

Adding to 13006731 its reverse (13760031), we get a palindrome (26766762).

The spelling of 13006731 in words is "thirteen million, six thousand, seven hundred thirty-one".