18977141 has 2 divisors, whose sum is σ = 18977142. Its totient is φ = 18977140.

The previous prime is 18977113. The next prime is 18977149. The reversal of 18977141 is 14177981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11874916 + 7102225 = 3446^2 + 2665^2 .

It is an emirp because it is prime and its reverse (14177981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18977141 - 2¹⁴ = 18960757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18977095 and 18977104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18977149) 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, 9488570 + 9488571.

It is an arithmetic number, because the mean of its divisors is an integer number (9488571).

Almost surely, 2^18977141 is an apocalyptic number.

It is an amenable number.

18977141 is a deficient number, since it is larger than the sum of its proper divisors (1).

18977141 is an equidigital number, since it uses as much as digits as its factorization.

18977141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 38.

The square root of 18977141 is about 4356.2760472679. The cubic root of 18977141 is about 266.7331096589.

The spelling of 18977141 in words is "eighteen million, nine hundred seventy-seven thousand, one hundred forty-one".