2018381 has 2 divisors, whose sum is σ = 2018382. Its totient is φ = 2018380.

The previous prime is 2018369. The next prime is 2018383. The reversal of 2018381 is 1838102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 828100 = 1091^2 + 910^2 .

It is a cyclic number.

It is not a de Polignac number, because 2018381 - 2¹⁴ = 2001997 is a prime.

It is a super-2 number, since 2×2018381² = 8147723722322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 2018383, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2018383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009190 + 1009191.

It is an arithmetic number, because the mean of its divisors is an integer number (1009191).

2^2018381 is an apocalyptic number.

It is an amenable number.

2018381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2018381 is an equidigital number, since it uses as much as digits as its factorization.

2018381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 2018381 is about 1420.6973639731. The cubic root of 2018381 is about 126.3769053638.

The spelling of 2018381 in words is "two million, eighteen thousand, three hundred eighty-one".