18487201 has 2 divisors, whose sum is σ = 18487202. Its totient is φ = 18487200.

The previous prime is 18487199. The next prime is 18487207. The reversal of 18487201 is 10278481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12960000 + 5527201 = 3600^2 + 2351^2 .

It is an emirp because it is prime and its reverse (10278481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18487201 - 2¹ = 18487199 is a prime.

Together with 18487199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18487207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9243600 + 9243601.

It is an arithmetic number, because the mean of its divisors is an integer number (9243601).

Almost surely, 2^18487201 is an apocalyptic number.

It is an amenable number.

18487201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18487201 is an equidigital number, since it uses as much as digits as its factorization.

18487201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 18487201 is about 4299.6745225656. The cubic root of 18487201 is about 264.4176174574.

The spelling of 18487201 in words is "eighteen million, four hundred eighty-seven thousand, two hundred one".