18154321 has 2 divisors, whose sum is σ = 18154322. Its totient is φ = 18154320.

The previous prime is 18154307. The next prime is 18154327. The reversal of 18154321 is 12345181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12702096 + 5452225 = 3564^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 18154321 - 2⁷ = 18154193 is a prime.

It is not a weakly prime, because it can be changed into another prime (18154327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9077160 + 9077161.

It is an arithmetic number, because the mean of its divisors is an integer number (9077161).

Almost surely, 2^18154321 is an apocalyptic number.

It is an amenable number.

18154321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18154321 is an equidigital number, since it uses as much as digits as its factorization.

18154321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 25.

The square root of 18154321 is about 4260.7887767408. The cubic root of 18154321 is about 262.8209637031.

The spelling of 18154321 in words is "eighteen million, one hundred fifty-four thousand, three hundred twenty-one".