18500071 has 2 divisors, whose sum is σ = 18500072. Its totient is φ = 18500070.

The previous prime is 18500051. The next prime is 18500081. The reversal of 18500071 is 17000581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18500071 - 2⁵ = 18500039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18500051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9250035 + 9250036.

It is an arithmetic number, because the mean of its divisors is an integer number (9250036).

Almost surely, 2^18500071 is an apocalyptic number.

18500071 is a deficient number, since it is larger than the sum of its proper divisors (1).

18500071 is an equidigital number, since it uses as much as digits as its factorization.

18500071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 18500071 is about 4301.1708870957. The cubic root of 18500071 is about 264.4789619763.

The spelling of 18500071 in words is "eighteen million, five hundred thousand, seventy-one".