18518069 has 2 divisors, whose sum is σ = 18518070. Its totient is φ = 18518068.

The previous prime is 18518057. The next prime is 18518081. The reversal of 18518069 is 96081581.

It is a balanced prime because it is at equal distance from previous prime (18518057) and next prime (18518081).

It can be written as a sum of positive squares in only one way, i.e., 15507844 + 3010225 = 3938^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 18518069 - 2⁴ = 18518053 is a prime.

It is a super-2 number, since 2×18518069² = 685837758977522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18518009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9259034 + 9259035.

It is an arithmetic number, because the mean of its divisors is an integer number (9259035).

Almost surely, 2^18518069 is an apocalyptic number.

It is an amenable number.

18518069 is a deficient number, since it is larger than the sum of its proper divisors (1).

18518069 is an equidigital number, since it uses as much as digits as its factorization.

18518069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 18518069 is about 4303.2625994703. The cubic root of 18518069 is about 264.5647012789.

The spelling of 18518069 in words is "eighteen million, five hundred eighteen thousand, sixty-nine".