1841841821 has 2 divisors, whose sum is σ = 1841841822. Its totient is φ = 1841841820.

The previous prime is 1841841797. The next prime is 1841841853. The reversal of 1841841821 is 1281481481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1832781721 + 9060100 = 42811^2 + 3010^2 .

It is a cyclic number.

It is not a de Polignac number, because 1841841821 - 2¹⁴ = 1841825437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1841841121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920920910 + 920920911.

It is an arithmetic number, because the mean of its divisors is an integer number (920920911).

Almost surely, 2^1841841821 is an apocalyptic number.

It is an amenable number.

1841841821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1841841821 is an equidigital number, since it uses as much as digits as its factorization.

1841841821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16384, while the sum is 38.

The square root of 1841841821 is about 42916.6846459509. The cubic root of 1841841821 is about 1225.7938646535.

The spelling of 1841841821 in words is "one billion, eight hundred forty-one million, eight hundred forty-one thousand, eight hundred twenty-one".