1918198237 has 2 divisors, whose sum is σ = 1918198238. Its totient is φ = 1918198236.

The previous prime is 1918198231. The next prime is 1918198283. The reversal of 1918198237 is 7328918191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1767866116 + 150332121 = 42046^2 + 12261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918198237 - 2⁷ = 1918198109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918198231) 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, 959099118 + 959099119.

It is an arithmetic number, because the mean of its divisors is an integer number (959099119).

Almost surely, 2^1918198237 is an apocalyptic number.

It is an amenable number.

1918198237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918198237 is an equidigital number, since it uses as much as digits as its factorization.

1918198237 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 1918198237 is about 43797.2400614468. The cubic root of 1918198237 is about 1242.5040962205.

The spelling of 1918198237 in words is "one billion, nine hundred eighteen million, one hundred ninety-eight thousand, two hundred thirty-seven".