81125327 has 2 divisors, whose sum is σ = 81125328. Its totient is φ = 81125326.

The previous prime is 81125281. The next prime is 81125333. The reversal of 81125327 is 72352118.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81125327 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81125327.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81125027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40562663 + 40562664.

It is an arithmetic number, because the mean of its divisors is an integer number (40562664).

Almost surely, 2^81125327 is an apocalyptic number.

81125327 is a deficient number, since it is larger than the sum of its proper divisors (1).

81125327 is an equidigital number, since it uses as much as digits as its factorization.

81125327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 29.

The square root of 81125327 is about 9006.9599199730. The cubic root of 81125327 is about 432.8979077205.

The spelling of 81125327 in words is "eighty-one million, one hundred twenty-five thousand, three hundred twenty-seven".