13665031 has 4 divisors (see below), whose sum is σ = 13672672. Its totient is φ = 13657392.

The previous prime is 13665023. The next prime is 13665053. The reversal of 13665031 is 13056631.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13056631 = 7 ⋅1865233.

It is a cyclic number.

It is not a de Polignac number, because 13665031 - 2³ = 13665023 is a prime.

It is a super-2 number, since 2×13665031² = 373466144461922, 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 = 13664987 and 13665005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13665011) 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, 466 + ... + 5248.

It is an arithmetic number, because the mean of its divisors is an integer number (3418168).

Almost surely, 2^13665031 is an apocalyptic number.

13665031 is a deficient number, since it is larger than the sum of its proper divisors (7641).

13665031 is an equidigital number, since it uses as much as digits as its factorization.

13665031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7640.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 13665031 is about 3696.6242708720. The cubic root of 13665031 is about 239.0764914505.

Subtracting from 13665031 its reverse (13056631), we obtain a square (608400 = 780²).

The spelling of 13665031 in words is "thirteen million, six hundred sixty-five thousand, thirty-one".