1820091863 has 2 divisors, whose sum is σ = 1820091864. Its totient is φ = 1820091862.

The previous prime is 1820091857. The next prime is 1820091941. The reversal of 1820091863 is 3681900281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1820091863 - 2⁶ = 1820091799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820091463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910045931 + 910045932.

It is an arithmetic number, because the mean of its divisors is an integer number (910045932).

Almost surely, 2^1820091863 is an apocalyptic number.

1820091863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820091863 is an equidigital number, since it uses as much as digits as its factorization.

1820091863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1820091863 is about 42662.5346527841. The cubic root of 1820091863 is about 1220.9496911987.

The spelling of 1820091863 in words is "one billion, eight hundred twenty million, ninety-one thousand, eight hundred sixty-three".