18948133 has 2 divisors, whose sum is σ = 18948134. Its totient is φ = 18948132.

The previous prime is 18948131. The next prime is 18948169. The reversal of 18948133 is 33184981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16265089 + 2683044 = 4033^2 + 1638^2 .

It is an emirp because it is prime and its reverse (33184981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18948133 - 2¹ = 18948131 is a prime.

Together with 18948131, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18948092 and 18948101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18948131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474066 + 9474067.

It is an arithmetic number, because the mean of its divisors is an integer number (9474067).

Almost surely, 2^18948133 is an apocalyptic number.

It is an amenable number.

18948133 is a deficient number, since it is larger than the sum of its proper divisors (1).

18948133 is an equidigital number, since it uses as much as digits as its factorization.

18948133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 18948133 is about 4352.9453247198. The cubic root of 18948133 is about 266.5971330859.

The spelling of 18948133 in words is "eighteen million, nine hundred forty-eight thousand, one hundred thirty-three".