820932881 has 2 divisors, whose sum is σ = 820932882. Its totient is φ = 820932880.

The previous prime is 820932863. The next prime is 820932911. The reversal of 820932881 is 188239028.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 797497600 + 23435281 = 28240^2 + 4841^2 .

It is a cyclic number.

It is not a de Polignac number, because 820932881 - 2⁶ = 820932817 is a prime.

It is a super-2 number, since 2×820932881² = 1347861590213920322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (820932811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410466440 + 410466441.

It is an arithmetic number, because the mean of its divisors is an integer number (410466441).

Almost surely, 2^820932881 is an apocalyptic number.

It is an amenable number.

820932881 is a deficient number, since it is larger than the sum of its proper divisors (1).

820932881 is an equidigital number, since it uses as much as digits as its factorization.

820932881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 820932881 is about 28651.9263052242. The cubic root of 820932881 is about 936.3449739097.

The spelling of 820932881 in words is "eight hundred twenty million, nine hundred thirty-two thousand, eight hundred eighty-one".