18123361 has 2 divisors, whose sum is σ = 18123362. Its totient is φ = 18123360.

The previous prime is 18123331. The next prime is 18123367. The reversal of 18123361 is 16332181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17172736 + 950625 = 4144^2 + 975^2 .

It is a cyclic number.

It is not a de Polignac number, because 18123361 - 2²¹ = 16026209 is a prime.

It is not a weakly prime, because it can be changed into another prime (18123367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061680 + 9061681.

It is an arithmetic number, because the mean of its divisors is an integer number (9061681).

Almost surely, 2^18123361 is an apocalyptic number.

It is an amenable number.

18123361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18123361 is an equidigital number, since it uses as much as digits as its factorization.

18123361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 18123361 is about 4257.1540963418. The cubic root of 18123361 is about 262.6714755648.

The spelling of 18123361 in words is "eighteen million, one hundred twenty-three thousand, three hundred sixty-one".