18509741 has 2 divisors, whose sum is σ = 18509742. Its totient is φ = 18509740.

The previous prime is 18509717. The next prime is 18509749. The reversal of 18509741 is 14790581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12888100 + 5621641 = 3590^2 + 2371^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18509741 is a prime.

It is a super-2 number, since 2×18509741² = 685221023774162, which contains 22 as substring.

It is a Sophie Germain 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 (18509749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9254870 + 9254871.

It is an arithmetic number, because the mean of its divisors is an integer number (9254871).

Almost surely, 2^18509741 is an apocalyptic number.

It is an amenable number.

18509741 is a deficient number, since it is larger than the sum of its proper divisors (1).

18509741 is an equidigital number, since it uses as much as digits as its factorization.

18509741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 18509741 is about 4302.2948527501. The cubic root of 18509741 is about 264.5250350623.

The spelling of 18509741 in words is "eighteen million, five hundred nine thousand, seven hundred forty-one".