18343081 has 2 divisors, whose sum is σ = 18343082. Its totient is φ = 18343080.

The previous prime is 18343079. The next prime is 18343093. The reversal of 18343081 is 18034381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17505856 + 837225 = 4184^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 18343081 - 2¹ = 18343079 is a prime.

It is a super-2 number, since 2×18343081² = 672937241145122, which contains 22 as substring.

Together with 18343079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18343001) 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 as a sum of consecutive naturals, namely, 9171540 + 9171541.

It is an arithmetic number, because the mean of its divisors is an integer number (9171541).

Almost surely, 2^18343081 is an apocalyptic number.

It is an amenable number.

18343081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18343081 is an equidigital number, since it uses as much as digits as its factorization.

18343081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18343081 is about 4282.8823238562. The cubic root of 18343081 is about 263.7287206090.

It can be divided in two parts, 183 and 43081, that added together give a square (43264 = 208²).

The spelling of 18343081 in words is "eighteen million, three hundred forty-three thousand, eighty-one".