81250027 has 2 divisors, whose sum is σ = 81250028. Its totient is φ = 81250026.

The previous prime is 81250019. The next prime is 81250033. The reversal of 81250027 is 72005218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81250027 - 2³ = 81250019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81249983 and 81250010.

It is not a weakly prime, because it can be changed into another prime (81250067) 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, 40625013 + 40625014.

It is an arithmetic number, because the mean of its divisors is an integer number (40625014).

Almost surely, 2^81250027 is an apocalyptic number.

81250027 is a deficient number, since it is larger than the sum of its proper divisors (1).

81250027 is an equidigital number, since it uses as much as digits as its factorization.

81250027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 81250027 is about 9013.8796863504. The cubic root of 81250027 is about 433.1196006468.

The spelling of 81250027 in words is "eighty-one million, two hundred fifty thousand, twenty-seven".