81827099 has 2 divisors, whose sum is σ = 81827100. Its totient is φ = 81827098.

The previous prime is 81827093. The next prime is 81827117. The reversal of 81827099 is 99072818.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81827099 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_4769891 and since 81827099 and 4769891 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (81827093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40913549 + 40913550.

It is an arithmetic number, because the mean of its divisors is an integer number (40913550).

Almost surely, 2^81827099 is an apocalyptic number.

81827099 is a deficient number, since it is larger than the sum of its proper divisors (1).

81827099 is an equidigital number, since it uses as much as digits as its factorization.

81827099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 81827099 is about 9045.8332396745. The cubic root of 81827099 is about 434.1425820042.

The spelling of 81827099 in words is "eighty-one million, eight hundred twenty-seven thousand, ninety-nine".