18315071 has 2 divisors, whose sum is σ = 18315072. Its totient is φ = 18315070.

The previous prime is 18315049. The next prime is 18315091. The reversal of 18315071 is 17051381.

It is a strong prime.

It is an emirp because it is prime and its reverse (17051381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18315071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18315071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18315091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9157535 + 9157536.

It is an arithmetic number, because the mean of its divisors is an integer number (9157536).

Almost surely, 2^18315071 is an apocalyptic number.

18315071 is a deficient number, since it is larger than the sum of its proper divisors (1).

18315071 is an equidigital number, since it uses as much as digits as its factorization.

18315071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 18315071 is about 4279.6110804605. The cubic root of 18315071 is about 263.5944137519.

The spelling of 18315071 in words is "eighteen million, three hundred fifteen thousand, seventy-one".