18348481 has 2 divisors, whose sum is σ = 18348482. Its totient is φ = 18348480.

The previous prime is 18348479. The next prime is 18348493. The reversal of 18348481 is 18484381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 370881 = 4240^2 + 609^2 .

It is an emirp because it is prime and its reverse (18484381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18348481 - 2¹ = 18348479 is a prime.

It is a super-2 number, since 2×18348481² = 673333510014722, which contains 22 as substring.

Together with 18348479, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18348481.

It is not a weakly prime, because it can be changed into another prime (18348581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9174240 + 9174241.

It is an arithmetic number, because the mean of its divisors is an integer number (9174241).

Almost surely, 2^18348481 is an apocalyptic number.

It is an amenable number.

18348481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18348481 is an equidigital number, since it uses as much as digits as its factorization.

18348481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 37.

The square root of 18348481 is about 4283.5126940398. The cubic root of 18348481 is about 263.7545976752.

The spelling of 18348481 in words is "eighteen million, three hundred forty-eight thousand, four hundred eighty-one".