81992927 has 2 divisors, whose sum is σ = 81992928. Its totient is φ = 81992926.

The previous prime is 81992909. The next prime is 81992929. The reversal of 81992927 is 72929918.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81992927 - 2¹⁸ = 81730783 is a prime.

Together with 81992929, 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 (81992929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40996463 + 40996464.

It is an arithmetic number, because the mean of its divisors is an integer number (40996464).

Almost surely, 2^81992927 is an apocalyptic number.

81992927 is a deficient number, since it is larger than the sum of its proper divisors (1).

81992927 is an equidigital number, since it uses as much as digits as its factorization.

81992927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 81992927 is about 9054.9945886235. The cubic root of 81992927 is about 434.4356569504.

The spelling of 81992927 in words is "eighty-one million, nine hundred ninety-two thousand, nine hundred twenty-seven".