623000821 has 2 divisors, whose sum is σ = 623000822. Its totient is φ = 623000820.

The previous prime is 623000803. The next prime is 623000837. The reversal of 623000821 is 128000326.

623000821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402804900 + 220195921 = 20070^2 + 14839^2 .

It is a cyclic number.

It is not a de Polignac number, because 623000821 - 2²³ = 614612213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 623000792 and 623000801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623000621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311500410 + 311500411.

It is an arithmetic number, because the mean of its divisors is an integer number (311500411).

Almost surely, 2^623000821 is an apocalyptic number.

It is an amenable number.

623000821 is a deficient number, since it is larger than the sum of its proper divisors (1).

623000821 is an equidigital number, since it uses as much as digits as its factorization.

623000821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 623000821 is about 24959.9843950272. The cubic root of 623000821 is about 854.0753868187.

The spelling of 623000821 in words is "six hundred twenty-three million, eight hundred twenty-one", and thus it is an aban number.