2018815993 has 2 divisors, whose sum is σ = 2018815994. Its totient is φ = 2018815992.

The previous prime is 2018815991. The next prime is 2018816021. The reversal of 2018815993 is 3995188102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1634342329 + 384473664 = 40427^2 + 19608^2 .

It is a cyclic number.

It is not a de Polignac number, because 2018815993 - 2¹ = 2018815991 is a prime.

Together with 2018815991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2018815991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009407996 + 1009407997.

It is an arithmetic number, because the mean of its divisors is an integer number (1009407997).

Almost surely, 2^2018815993 is an apocalyptic number.

It is an amenable number.

2018815993 is a deficient number, since it is larger than the sum of its proper divisors (1).

2018815993 is an equidigital number, since it uses as much as digits as its factorization.

2018815993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 2018815993 is about 44931.2362727758. The cubic root of 2018815993 is about 1263.8598345167.

The spelling of 2018815993 in words is "two billion, eighteen million, eight hundred fifteen thousand, nine hundred ninety-three".