8215820923 has 2 divisors, whose sum is σ = 8215820924. Its totient is φ = 8215820922.

The previous prime is 8215820909. The next prime is 8215820999. The reversal of 8215820923 is 3290285128.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8215820923 is a prime.

It is not a weakly prime, because it can be changed into another prime (8215820903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4107910461 + 4107910462.

It is an arithmetic number, because the mean of its divisors is an integer number (4107910462).

Almost surely, 2^8215820923 is an apocalyptic number.

8215820923 is a deficient number, since it is larger than the sum of its proper divisors (1).

8215820923 is an equidigital number, since it uses as much as digits as its factorization.

8215820923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 8215820923 is about 90641.1657195559. The cubic root of 8215820923 is about 2017.8257266316.

The spelling of 8215820923 in words is "eight billion, two hundred fifteen million, eight hundred twenty thousand, nine hundred twenty-three".