1821986863 has 2 divisors, whose sum is σ = 1821986864. Its totient is φ = 1821986862.

The previous prime is 1821986827. The next prime is 1821986869. The reversal of 1821986863 is 3686891281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1821986863 - 2²⁵ = 1788432431 is a prime.

It is a super-2 number, since 2×1821986863² = 6639272257889161538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1821986863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1821986869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910993431 + 910993432.

It is an arithmetic number, because the mean of its divisors is an integer number (910993432).

Almost surely, 2^1821986863 is an apocalyptic number.

1821986863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821986863 is an equidigital number, since it uses as much as digits as its factorization.

1821986863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 52.

The square root of 1821986863 is about 42684.7380570620. The cubic root of 1821986863 is about 1221.3732773560.

The spelling of 1821986863 in words is "one billion, eight hundred twenty-one million, nine hundred eighty-six thousand, eight hundred sixty-three".