18101749 has 2 divisors, whose sum is σ = 18101750. Its totient is φ = 18101748.

The previous prime is 18101723. The next prime is 18101761. The reversal of 18101749 is 94710181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17892900 + 208849 = 4230^2 + 457^2 .

It is a cyclic number.

It is not a de Polignac number, because 18101749 - 2⁵ = 18101717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18101749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18105749) 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, 9050874 + 9050875.

It is an arithmetic number, because the mean of its divisors is an integer number (9050875).

Almost surely, 2^18101749 is an apocalyptic number.

It is an amenable number.

18101749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18101749 is an equidigital number, since it uses as much as digits as its factorization.

18101749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 18101749 is about 4254.6150237125. The cubic root of 18101749 is about 262.5670226442.

The spelling of 18101749 in words is "eighteen million, one hundred one thousand, seven hundred forty-nine".