1918601863 has 2 divisors, whose sum is σ = 1918601864. Its totient is φ = 1918601862.

The previous prime is 1918601857. The next prime is 1918601891. The reversal of 1918601863 is 3681068191.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1918601863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918601803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959300931 + 959300932.

It is an arithmetic number, because the mean of its divisors is an integer number (959300932).

Almost surely, 2^1918601863 is an apocalyptic number.

1918601863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918601863 is an equidigital number, since it uses as much as digits as its factorization.

1918601863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 1918601863 is about 43801.8477121685. The cubic root of 1918601863 is about 1242.5912390711.

The spelling of 1918601863 in words is "one billion, nine hundred eighteen million, six hundred one thousand, eight hundred sixty-three".