81825127 has 2 divisors, whose sum is σ = 81825128. Its totient is φ = 81825126.

The previous prime is 81825091. The next prime is 81825137. The reversal of 81825127 is 72152818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81825127 - 2¹⁹ = 81300839 is a prime.

It is a super-2 number, since 2×81825127² = 13390702817132258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81825092 and 81825101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81825137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40912563 + 40912564.

It is an arithmetic number, because the mean of its divisors is an integer number (40912564).

Almost surely, 2^81825127 is an apocalyptic number.

81825127 is a deficient number, since it is larger than the sum of its proper divisors (1).

81825127 is an equidigital number, since it uses as much as digits as its factorization.

81825127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 34.

The square root of 81825127 is about 9045.7242385560. The cubic root of 81825127 is about 434.1390944226.

The spelling of 81825127 in words is "eighty-one million, eight hundred twenty-five thousand, one hundred twenty-seven".