81292927 has 2 divisors, whose sum is σ = 81292928. Its totient is φ = 81292926.

The previous prime is 81292921. The next prime is 81292933. The reversal of 81292927 is 72929218.

It is a balanced prime because it is at equal distance from previous prime (81292921) and next prime (81292933).

It is a cyclic number.

It is not a de Polignac number, because 81292927 - 2¹¹ = 81290879 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 81292927.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81292921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40646463 + 40646464.

It is an arithmetic number, because the mean of its divisors is an integer number (40646464).

Almost surely, 2^81292927 is an apocalyptic number.

81292927 is a deficient number, since it is larger than the sum of its proper divisors (1).

81292927 is an equidigital number, since it uses as much as digits as its factorization.

81292927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 81292927 is about 9016.2590357642. The cubic root of 81292927 is about 433.1958162588.

It can be divided in two parts, 812 and 92927, that added together give a palindrome (93739).

The spelling of 81292927 in words is "eighty-one million, two hundred ninety-two thousand, nine hundred twenty-seven".