18109733 has 2 divisors, whose sum is σ = 18109734. Its totient is φ = 18109732.

The previous prime is 18109727. The next prime is 18109739. The reversal of 18109733 is 33790181.

It is a balanced prime because it is at equal distance from previous prime (18109727) and next prime (18109739).

It can be written as a sum of positive squares in only one way, i.e., 17656804 + 452929 = 4202^2 + 673^2 .

It is an emirp because it is prime and its reverse (33790181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18109733 - 2¹⁰ = 18108709 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18109733.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18109739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9054866 + 9054867.

It is an arithmetic number, because the mean of its divisors is an integer number (9054867).

Almost surely, 2^18109733 is an apocalyptic number.

It is an amenable number.

18109733 is a deficient number, since it is larger than the sum of its proper divisors (1).

18109733 is an equidigital number, since it uses as much as digits as its factorization.

18109733 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 18109733 is about 4255.5531955317. The cubic root of 18109733 is about 262.6056197797.

The spelling of 18109733 in words is "eighteen million, one hundred nine thousand, seven hundred thirty-three".