81812124834227 has 2 divisors, whose sum is σ = 81812124834228. Its totient is φ = 81812124834226.

The previous prime is 81812124834173. The next prime is 81812124834289. The reversal of 81812124834227 is 72243842121818.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81812124834227 - 2¹⁸ = 81812124572083 is a prime.

It is a super-2 number, since 2×81812124834227² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81812124834127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40906062417113 + 40906062417114.

It is an arithmetic number, because the mean of its divisors is an integer number (40906062417114).

Almost surely, 2^{81812124834227} is an apocalyptic number.

81812124834227 is a deficient number, since it is larger than the sum of its proper divisors (1).

81812124834227 is an equidigital number, since it uses as much as digits as its factorization.

81812124834227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2752512, while the sum is 53.

The spelling of 81812124834227 in words is "eighty-one trillion, eight hundred twelve billion, one hundred twenty-four million, eight hundred thirty-four thousand, two hundred twenty-seven".