13817774081 has 4 divisors (see below), whose sum is σ = 13824924372. Its totient is φ = 13810623792.

The previous prime is 13817774077. The next prime is 13817774083. The reversal of 13817774081 is 18047771831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18047771831 = 1039 ⋅17370329.

It can be written as a sum of positive squares in 2 ways, for example, as 9605764081 + 4212010000 = 98009^2 + 64900^2 .

It is a cyclic number.

It is not a de Polignac number, because 13817774081 - 2² = 13817774077 is a prime.

It is a super-2 number, since 2×13817774081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13817774083) 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 in 3 ways as a sum of consecutive naturals, for example, 3572246 + ... + 3576111.

It is an arithmetic number, because the mean of its divisors is an integer number (3456231093).

Almost surely, 2^13817774081 is an apocalyptic number.

It is an amenable number.

13817774081 is a deficient number, since it is larger than the sum of its proper divisors (7150291).

13817774081 is an equidigital number, since it uses as much as digits as its factorization.

13817774081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7150290.

The product of its (nonzero) digits is 263424, while the sum is 47.

The spelling of 13817774081 in words is "thirteen billion, eight hundred seventeen million, seven hundred seventy-four thousand, eighty-one".