18975871 has 2 divisors, whose sum is σ = 18975872. Its totient is φ = 18975870.

The previous prime is 18975833. The next prime is 18975881. The reversal of 18975871 is 17857981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18975871 - 2¹⁵ = 18943103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18975811) 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, 9487935 + 9487936.

It is an arithmetic number, because the mean of its divisors is an integer number (9487936).

Almost surely, 2^18975871 is an apocalyptic number.

18975871 is a deficient number, since it is larger than the sum of its proper divisors (1).

18975871 is an equidigital number, since it uses as much as digits as its factorization.

18975871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 46.

The square root of 18975871 is about 4356.1302781253. The cubic root of 18975871 is about 266.7271593666.

The spelling of 18975871 in words is "eighteen million, nine hundred seventy-five thousand, eight hundred seventy-one".