820894471 has 2 divisors, whose sum is σ = 820894472. Its totient is φ = 820894470.

The previous prime is 820894463. The next prime is 820894511. The reversal of 820894471 is 174498028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820894471 - 2³ = 820894463 is a prime.

It is a super-3 number, since 3×820894471³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820894171) 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, 410447235 + 410447236.

It is an arithmetic number, because the mean of its divisors is an integer number (410447236).

Almost surely, 2^820894471 is an apocalyptic number.

820894471 is a deficient number, since it is larger than the sum of its proper divisors (1).

820894471 is an equidigital number, since it uses as much as digits as its factorization.

820894471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 820894471 is about 28651.2560108628. The cubic root of 820894471 is about 936.3303703726.

The spelling of 820894471 in words is "eight hundred twenty million, eight hundred ninety-four thousand, four hundred seventy-one".