1821963937 has 2 divisors, whose sum is σ = 1821963938. Its totient is φ = 1821963936.

The previous prime is 1821963931. The next prime is 1821964019. The reversal of 1821963937 is 7393691281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1294848256 + 527115681 = 35984^2 + 22959^2 .

It is a cyclic number.

It is not a de Polignac number, because 1821963937 - 2²⁷ = 1687746209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1821963931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910981968 + 910981969.

It is an arithmetic number, because the mean of its divisors is an integer number (910981969).

Almost surely, 2^1821963937 is an apocalyptic number.

It is an amenable number.

1821963937 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821963937 is an equidigital number, since it uses as much as digits as its factorization.

1821963937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 1821963937 is about 42684.4695058987. The cubic root of 1821963937 is about 1221.3681545015.

The spelling of 1821963937 in words is "one billion, eight hundred twenty-one million, nine hundred sixty-three thousand, nine hundred thirty-seven".