1848456821 has 2 divisors, whose sum is σ = 1848456822. Its totient is φ = 1848456820.

The previous prime is 1848456791. The next prime is 1848456887. The reversal of 1848456821 is 1286548481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1088076196 + 760380625 = 32986^2 + 27575^2 .

It is a cyclic number.

It is not a de Polignac number, because 1848456821 - 2¹⁰ = 1848455797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1848456521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 924228410 + 924228411.

It is an arithmetic number, because the mean of its divisors is an integer number (924228411).

Almost surely, 2^1848456821 is an apocalyptic number.

It is an amenable number.

1848456821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1848456821 is an equidigital number, since it uses as much as digits as its factorization.

1848456821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 491520, while the sum is 47.

The square root of 1848456821 is about 42993.6835011842. The cubic root of 1848456821 is about 1227.2595964428.

The spelling of 1848456821 in words is "one billion, eight hundred forty-eight million, four hundred fifty-six thousand, eight hundred twenty-one".