820490899 has 2 divisors, whose sum is σ = 820490900. Its totient is φ = 820490898.

The previous prime is 820490887. The next prime is 820490903. The reversal of 820490899 is 998094028.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820490899 - 2¹⁹ = 819966611 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (820490849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410245449 + 410245450.

It is an arithmetic number, because the mean of its divisors is an integer number (410245450).

Almost surely, 2^820490899 is an apocalyptic number.

820490899 is a deficient number, since it is larger than the sum of its proper divisors (1).

820490899 is an equidigital number, since it uses as much as digits as its factorization.

820490899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 820490899 is about 28644.2123124376. The cubic root of 820490899 is about 936.1769041741.

The spelling of 820490899 in words is "eight hundred twenty million, four hundred ninety thousand, eight hundred ninety-nine".