820417903 has 2 divisors, whose sum is σ = 820417904. Its totient is φ = 820417902.

The previous prime is 820417901. The next prime is 820417921. The reversal of 820417903 is 309714028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820417903 - 2¹ = 820417901 is a prime.

Together with 820417901, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820417901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410208951 + 410208952.

It is an arithmetic number, because the mean of its divisors is an integer number (410208952).

Almost surely, 2^820417903 is an apocalyptic number.

820417903 is a deficient number, since it is larger than the sum of its proper divisors (1).

820417903 is an equidigital number, since it uses as much as digits as its factorization.

820417903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 820417903 is about 28642.9380999925. The cubic root of 820417903 is about 936.1491406340.

The spelling of 820417903 in words is "eight hundred twenty million, four hundred seventeen thousand, nine hundred three".