1918841311 has 2 divisors, whose sum is σ = 1918841312. Its totient is φ = 1918841310.

The previous prime is 1918841299. The next prime is 1918841321. The reversal of 1918841311 is 1131488191.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1131488191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1918841311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918841321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959420655 + 959420656.

It is an arithmetic number, because the mean of its divisors is an integer number (959420656).

Almost surely, 2^1918841311 is an apocalyptic number.

1918841311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918841311 is an equidigital number, since it uses as much as digits as its factorization.

1918841311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 37.

The square root of 1918841311 is about 43804.5809362446. The cubic root of 1918841311 is about 1242.6429301168.

The spelling of 1918841311 in words is "one billion, nine hundred eighteen million, eight hundred forty-one thousand, three hundred eleven".