13817813 has 4 divisors (see below), whose sum is σ = 13910700. Its totient is φ = 13724928.

The previous prime is 13817743. The next prime is 13817819. The reversal of 13817813 is 31871831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31871831 = 433 ⋅73607.

It can be written as a sum of positive squares in 2 ways, for example, as 4919524 + 8898289 = 2218^2 + 2983^2 .

It is a cyclic number.

It is not a de Polignac number, because 13817813 - 2¹⁸ = 13555669 is a prime.

It is a super-2 number, since 2×13817813² = 381863912205938, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13817813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13817819) 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, 46220 + ... + 46517.

It is an arithmetic number, because the mean of its divisors is an integer number (3477675).

Almost surely, 2^13817813 is an apocalyptic number.

It is an amenable number.

13817813 is a deficient number, since it is larger than the sum of its proper divisors (92887).

13817813 is an equidigital number, since it uses as much as digits as its factorization.

13817813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92886.

The product of its digits is 4032, while the sum is 32.

The square root of 13817813 is about 3717.2319002182. The cubic root of 13817813 is about 239.9641902590.

The spelling of 13817813 in words is "thirteen million, eight hundred seventeen thousand, eight hundred thirteen".