820965143 has 2 divisors, whose sum is σ = 820965144. Its totient is φ = 820965142.

The previous prime is 820965113. The next prime is 820965161. The reversal of 820965143 is 341569028.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820965143 - 2⁸ = 820964887 is a prime.

It is a super-3 number, since 3×820965143³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 820965097 and 820965106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820965113) 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, 410482571 + 410482572.

It is an arithmetic number, because the mean of its divisors is an integer number (410482572).

Almost surely, 2^820965143 is an apocalyptic number.

820965143 is a deficient number, since it is larger than the sum of its proper divisors (1).

820965143 is an equidigital number, since it uses as much as digits as its factorization.

820965143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 820965143 is about 28652.4892984885. The cubic root of 820965143 is about 936.3572396165.

The spelling of 820965143 in words is "eight hundred twenty million, nine hundred sixty-five thousand, one hundred forty-three".