18881141 has 2 divisors, whose sum is σ = 18881142. Its totient is φ = 18881140.

The previous prime is 18881129. The next prime is 18881143. The reversal of 18881141 is 14118881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 2116 = 4345^2 + 46^2 .

It is a cyclic number.

It is not a de Polignac number, because 18881141 - 2¹⁰ = 18880117 is a prime.

Together with 18881143, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18881098 and 18881107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18881143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9440570 + 9440571.

It is an arithmetic number, because the mean of its divisors is an integer number (9440571).

Almost surely, 2^18881141 is an apocalyptic number.

It is an amenable number.

18881141 is a deficient number, since it is larger than the sum of its proper divisors (1).

18881141 is an equidigital number, since it uses as much as digits as its factorization.

18881141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 32.

The square root of 18881141 is about 4345.2434914513. The cubic root of 18881141 is about 266.2825732518.

The spelling of 18881141 in words is "eighteen million, eight hundred eighty-one thousand, one hundred forty-one".