1923468821 has 2 divisors, whose sum is σ = 1923468822. Its totient is φ = 1923468820.

The previous prime is 1923468803. The next prime is 1923468847. The reversal of 1923468821 is 1288643291.

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., 1897560721 + 25908100 = 43561^2 + 5090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1923468821 - 2¹⁰ = 1923467797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1923468851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 961734410 + 961734411.

It is an arithmetic number, because the mean of its divisors is an integer number (961734411).

Almost surely, 2^1923468821 is an apocalyptic number.

It is an amenable number.

1923468821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1923468821 is an equidigital number, since it uses as much as digits as its factorization.

1923468821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 44.

The square root of 1923468821 is about 43857.3690615386. The cubic root of 1923468821 is about 1243.6410543832.

The spelling of 1923468821 in words is "one billion, nine hundred twenty-three million, four hundred sixty-eight thousand, eight hundred twenty-one".