18671801 has 2 divisors, whose sum is σ = 18671802. Its totient is φ = 18671800.

The previous prime is 18671777. The next prime is 18671833. The reversal of 18671801 is 10817681.

It is an a-pointer prime, because the next prime (18671833) can be obtained adding 18671801 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14830201 + 3841600 = 3851^2 + 1960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18671801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18671881) 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, 9335900 + 9335901.

It is an arithmetic number, because the mean of its divisors is an integer number (9335901).

Almost surely, 2^18671801 is an apocalyptic number.

It is an amenable number.

18671801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18671801 is an equidigital number, since it uses as much as digits as its factorization.

18671801 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 32.

The square root of 18671801 is about 4321.0879417110. The cubic root of 18671801 is about 265.2947994946.

The spelling of 18671801 in words is "eighteen million, six hundred seventy-one thousand, eight hundred one".