18140917 has 2 divisors, whose sum is σ = 18140918. Its totient is φ = 18140916.

The previous prime is 18140909. The next prime is 18140923. The reversal of 18140917 is 71904181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17230801 + 910116 = 4151^2 + 954^2 .

It is an emirp because it is prime and its reverse (71904181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18140917 - 2³ = 18140909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18140957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070458 + 9070459.

It is an arithmetic number, because the mean of its divisors is an integer number (9070459).

Almost surely, 2^18140917 is an apocalyptic number.

It is an amenable number.

18140917 is a deficient number, since it is larger than the sum of its proper divisors (1).

18140917 is an equidigital number, since it uses as much as digits as its factorization.

18140917 is an evil number, because the sum of its binary digits is even.

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

The square root of 18140917 is about 4259.2155381009. The cubic root of 18140917 is about 262.7562643299.

The spelling of 18140917 in words is "eighteen million, one hundred forty thousand, nine hundred seventeen".