83820811 has 2 divisors, whose sum is σ = 83820812. Its totient is φ = 83820810.

The previous prime is 83820773. The next prime is 83820827. The reversal of 83820811 is 11802838.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83820811 is a prime.

It is not a weakly prime, because it can be changed into another prime (83820871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41910405 + 41910406.

It is an arithmetic number, because the mean of its divisors is an integer number (41910406).

Almost surely, 2^83820811 is an apocalyptic number.

83820811 is a deficient number, since it is larger than the sum of its proper divisors (1).

83820811 is an equidigital number, since it uses as much as digits as its factorization.

83820811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 83820811 is about 9155.3706096477. The cubic root of 83820811 is about 437.6402789349.

The spelling of 83820811 in words is "eighty-three million, eight hundred twenty thousand, eight hundred eleven".