13813481 has 6 divisors (see below), whose sum is σ = 15183546.
Its totient is φ = 12557600.
The previous prime is 13813477. The next prime is 13813487. The reversal of 13813481 is 18431831.
It can be written as a sum of positive squares in only one way, i.e., 13579225 + 234256 = 3685^2 + 484^2
It is not a de Polignac number, because 13813481 - 22 = 13813477 is a prime.
It is a super-2 number, since 2×138134812 = 381624514674722, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (13813487) 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 5 ways as a sum of consecutive naturals, for example, 56960 + ... + 57201.
It is an arithmetic number, because the mean of its divisors is an integer number (2530591).
Almost surely, 213813481 is an apocalyptic number.
13813481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
It is an amenable number.
13813481 is a deficient number, since it is larger than the sum of its proper divisors (1370065).
13813481 is a wasteful number, since it uses less digits than its factorization.
13813481 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 114183 (or 114172 counting only the distinct ones).
The product of its digits is 2304, while the sum is 29.
The square root of 13813481 is about 3716.6491628885.
The cubic root of 13813481 is about 239.9391107108.
The spelling of 13813481 in words is "thirteen million, eight hundred thirteen thousand, four hundred eighty-one".