18948121 has 2 divisors, whose sum is σ = 18948122. Its totient is φ = 18948120.

The previous prime is 18948089. The next prime is 18948131. The reversal of 18948121 is 12184981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11978521 + 6969600 = 3461^2 + 2640^2 .

It is a cyclic number.

It is not a de Polignac number, because 18948121 - 2⁵ = 18948089 is a prime.

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, 9474060 + 9474061.

It is an arithmetic number, because the mean of its divisors is an integer number (9474061).

Almost surely, 2^18948121 is an apocalyptic number.

It is an amenable number.

18948121 is a deficient number, since it is larger than the sum of its proper divisors (1).

18948121 is an equidigital number, since it uses as much as digits as its factorization.

18948121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 34.

The square root of 18948121 is about 4352.9439463425. The cubic root of 18948121 is about 266.5970768066.

The spelling of 18948121 in words is "eighteen million, nine hundred forty-eight thousand, one hundred twenty-one".