18228701 has 2 divisors, whose sum is σ = 18228702. Its totient is φ = 18228700.

The previous prime is 18228677. The next prime is 18228703. The reversal of 18228701 is 10782281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16605625 + 1623076 = 4075^2 + 1274^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18228701 is a prime.

It is a Sophie Germain prime.

Together with 18228703, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18228703) 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, 9114350 + 9114351.

It is an arithmetic number, because the mean of its divisors is an integer number (9114351).

Almost surely, 2^18228701 is an apocalyptic number.

It is an amenable number.

18228701 is a deficient number, since it is larger than the sum of its proper divisors (1).

18228701 is an equidigital number, since it uses as much as digits as its factorization.

18228701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 18228701 is about 4269.5082855055. The cubic root of 18228701 is about 263.1794088790.

The spelling of 18228701 in words is "eighteen million, two hundred twenty-eight thousand, seven hundred one".