1986243163 has 2 divisors, whose sum is σ = 1986243164. Its totient is φ = 1986243162.

The previous prime is 1986243157. The next prime is 1986243167. The reversal of 1986243163 is 3613426891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1986243163 is a prime.

It is not a weakly prime, because it can be changed into another prime (1986243167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993121581 + 993121582.

It is an arithmetic number, because the mean of its divisors is an integer number (993121582).

Almost surely, 2^1986243163 is an apocalyptic number.

1986243163 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986243163 is an equidigital number, since it uses as much as digits as its factorization.

1986243163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The square root of 1986243163 is about 44567.2880373038. The cubic root of 1986243163 is about 1257.0256463607.

The spelling of 1986243163 in words is "one billion, nine hundred eighty-six million, two hundred forty-three thousand, one hundred sixty-three".