1816920823 has 2 divisors, whose sum is σ = 1816920824. Its totient is φ = 1816920822.

The previous prime is 1816920797. The next prime is 1816920851. The reversal of 1816920823 is 3280296181.

It is a weak prime.

It is an emirp because it is prime and its reverse (3280296181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1816920823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1816920893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908460411 + 908460412.

It is an arithmetic number, because the mean of its divisors is an integer number (908460412).

Almost surely, 2^1816920823 is an apocalyptic number.

1816920823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816920823 is an equidigital number, since it uses as much as digits as its factorization.

1816920823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1816920823 is about 42625.3542272671. The cubic root of 1816920823 is about 1220.2402158449.

The spelling of 1816920823 in words is "one billion, eight hundred sixteen million, nine hundred twenty thousand, eight hundred twenty-three".