1855491863 has 2 divisors, whose sum is σ = 1855491864. Its totient is φ = 1855491862.

The previous prime is 1855491829. The next prime is 1855491889. The reversal of 1855491863 is 3681945581.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1855491863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1855491263) 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, 927745931 + 927745932.

It is an arithmetic number, because the mean of its divisors is an integer number (927745932).

Almost surely, 2^1855491863 is an apocalyptic number.

1855491863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855491863 is an equidigital number, since it uses as much as digits as its factorization.

1855491863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1036800, while the sum is 50.

The square root of 1855491863 is about 43075.4206363676. The cubic root of 1855491863 is about 1228.8145678930.

The spelling of 1855491863 in words is "one billion, eight hundred fifty-five million, four hundred ninety-one thousand, eight hundred sixty-three".