820899539 has 2 divisors, whose sum is σ = 820899540. Its totient is φ = 820899538.

The previous prime is 820899523. The next prime is 820899637. The reversal of 820899539 is 935998028.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820899539 - 2⁴ = 820899523 is a prime.

It is not a weakly prime, because it can be changed into another prime (820899239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410449769 + 410449770.

It is an arithmetic number, because the mean of its divisors is an integer number (410449770).

Almost surely, 2^820899539 is an apocalyptic number.

820899539 is a deficient number, since it is larger than the sum of its proper divisors (1).

820899539 is an equidigital number, since it uses as much as digits as its factorization.

820899539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The square root of 820899539 is about 28651.3444536203. The cubic root of 820899539 is about 936.3322972596.

The spelling of 820899539 in words is "eight hundred twenty million, eight hundred ninety-nine thousand, five hundred thirty-nine".