81832061 has 2 divisors, whose sum is σ = 81832062. Its totient is φ = 81832060.

The previous prime is 81832057. The next prime is 81832063. The reversal of 81832061 is 16023818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54479161 + 27352900 = 7381^2 + 5230^2 .

It is a cyclic number.

It is not a de Polignac number, because 81832061 - 2² = 81832057 is a prime.

Together with 81832063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81832063) 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, 40916030 + 40916031.

It is an arithmetic number, because the mean of its divisors is an integer number (40916031).

Almost surely, 2^81832061 is an apocalyptic number.

It is an amenable number.

81832061 is a deficient number, since it is larger than the sum of its proper divisors (1).

81832061 is an equidigital number, since it uses as much as digits as its factorization.

81832061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 81832061 is about 9046.1075054412. The cubic root of 81832061 is about 434.1513573038.

Adding to 81832061 its reverse (16023818), we get a palindrome (97855879).

The spelling of 81832061 in words is "eighty-one million, eight hundred thirty-two thousand, sixty-one".