81924127 has 2 divisors, whose sum is σ = 81924128. Its totient is φ = 81924126.

The previous prime is 81924119. The next prime is 81924133. The reversal of 81924127 is 72142918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81924127 - 2³ = 81924119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81924092 and 81924101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81924107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40962063 + 40962064.

It is an arithmetic number, because the mean of its divisors is an integer number (40962064).

Almost surely, 2^81924127 is an apocalyptic number.

81924127 is a deficient number, since it is larger than the sum of its proper divisors (1).

81924127 is an equidigital number, since it uses as much as digits as its factorization.

81924127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 81924127 is about 9051.1947830107. The cubic root of 81924127 is about 434.3141117629.

The spelling of 81924127 in words is "eighty-one million, nine hundred twenty-four thousand, one hundred twenty-seven".