18006497 has 2 divisors, whose sum is σ = 18006498. Its totient is φ = 18006496.

The previous prime is 18006491. The next prime is 18006557. The reversal of 18006497 is 79460081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11015761 + 6990736 = 3319^2 + 2644^2 .

It is an emirp because it is prime and its reverse (79460081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18006497 - 2⁴ = 18006481 is a prime.

It is a super-2 number, since 2×18006497² = 648467868422018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18006491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9003248 + 9003249.

It is an arithmetic number, because the mean of its divisors is an integer number (9003249).

Almost surely, 2^18006497 is an apocalyptic number.

It is an amenable number.

18006497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18006497 is an equidigital number, since it uses as much as digits as its factorization.

18006497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 18006497 is about 4243.4062968328. The cubic root of 18006497 is about 262.1056670295.

The spelling of 18006497 in words is "eighteen million, six thousand, four hundred ninety-seven".