1822803781 has 2 divisors, whose sum is σ = 1822803782. Its totient is φ = 1822803780.

The previous prime is 1822803757. The next prime is 1822803811. The reversal of 1822803781 is 1873082281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1792167556 + 30636225 = 42334^2 + 5535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1822803781 - 2¹¹ = 1822801733 is a prime.

It is a super-2 number, since 2×1822803781² = 6645227248055791922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1822803721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911401890 + 911401891.

It is an arithmetic number, because the mean of its divisors is an integer number (911401891).

Almost surely, 2^1822803781 is an apocalyptic number.

It is an amenable number.

1822803781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1822803781 is an equidigital number, since it uses as much as digits as its factorization.

1822803781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 1822803781 is about 42694.3061894675. The cubic root of 1822803781 is about 1221.5557910634. Note that the first 3 decimals are identical.

The spelling of 1822803781 in words is "one billion, eight hundred twenty-two million, eight hundred three thousand, seven hundred eighty-one".