820449499 has 2 divisors, whose sum is σ = 820449500. Its totient is φ = 820449498.

The previous prime is 820449493. The next prime is 820449541. The reversal of 820449499 is 994944028.

820449499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820449499 is a prime.

It is a super-3 number, since 3×820449499³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (820449493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410224749 + 410224750.

It is an arithmetic number, because the mean of its divisors is an integer number (410224750).

Almost surely, 2^820449499 is an apocalyptic number.

820449499 is a deficient number, since it is larger than the sum of its proper divisors (1).

820449499 is an equidigital number, since it uses as much as digits as its factorization.

820449499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 820449499 is about 28643.4896442455. The cubic root of 820449499 is about 936.1611581632.

The spelling of 820449499 in words is "eight hundred twenty million, four hundred forty-nine thousand, four hundred ninety-nine".