820899523 has 2 divisors, whose sum is σ = 820899524. Its totient is φ = 820899522.

The previous prime is 820899517. The next prime is 820899539. The reversal of 820899523 is 325998028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820899523 - 2⁹ = 820899011 is a prime.

It is not a weakly prime, because it can be changed into another prime (820899323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410449761 + 410449762.

It is an arithmetic number, because the mean of its divisors is an integer number (410449762).

Almost surely, 2^820899523 is an apocalyptic number.

820899523 is a deficient number, since it is larger than the sum of its proper divisors (1).

820899523 is an equidigital number, since it uses as much as digits as its factorization.

820899523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 820899523 is about 28651.3441744013. The cubic root of 820899523 is about 936.3322911763.

The spelling of 820899523 in words is "eight hundred twenty million, eight hundred ninety-nine thousand, five hundred twenty-three".