18867001 has 2 divisors, whose sum is σ = 18867002. Its totient is φ = 18867000.

The previous prime is 18866983. The next prime is 18867007. The reversal of 18867001 is 10076881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17438976 + 1428025 = 4176^2 + 1195^2 .

It is an emirp because it is prime and its reverse (10076881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18867001 - 2²¹ = 16769849 is a prime.

It is not a weakly prime, because it can be changed into another prime (18867007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9433500 + 9433501.

It is an arithmetic number, because the mean of its divisors is an integer number (9433501).

Almost surely, 2^18867001 is an apocalyptic number.

It is an amenable number.

18867001 is a deficient number, since it is larger than the sum of its proper divisors (1).

18867001 is an equidigital number, since it uses as much as digits as its factorization.

18867001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 18867001 is about 4343.6161202390. The cubic root of 18867001 is about 266.2160840515.

The spelling of 18867001 in words is "eighteen million, eight hundred sixty-seven thousand, one".