1918218937 has 2 divisors, whose sum is σ = 1918218938. Its totient is φ = 1918218936.

The previous prime is 1918218931. The next prime is 1918218979. The reversal of 1918218937 is 7398128191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1894947961 + 23270976 = 43531^2 + 4824^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918218937 - 2¹¹ = 1918216889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1918218931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959109468 + 959109469.

It is an arithmetic number, because the mean of its divisors is an integer number (959109469).

Almost surely, 2^1918218937 is an apocalyptic number.

It is an amenable number.

1918218937 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918218937 is an equidigital number, since it uses as much as digits as its factorization.

1918218937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 49.

The square root of 1918218937 is about 43797.4763770699. The cubic root of 1918218937 is about 1242.5085656477.

It can be divided in two parts, 191 and 8218937, that added together give a palindrome (8219128).

The spelling of 1918218937 in words is "one billion, nine hundred eighteen million, two hundred eighteen thousand, nine hundred thirty-seven".