81270847249 has 2 divisors, whose sum is σ = 81270847250. Its totient is φ = 81270847248.

The previous prime is 81270847219. The next prime is 81270847363. The reversal of 81270847249 is 94274807218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80783850625 + 486996624 = 284225^2 + 22068^2 .

It is a cyclic number.

It is not a de Polignac number, because 81270847249 - 2¹⁵ = 81270814481 is a prime.

It is a super-2 number, since 2×81270847249² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81270847196 and 81270847205.

It is not a weakly prime, because it can be changed into another prime (81270847219) 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, 40635423624 + 40635423625.

It is an arithmetic number, because the mean of its divisors is an integer number (40635423625).

Almost surely, 2^81270847249 is an apocalyptic number.

It is an amenable number.

81270847249 is a deficient number, since it is larger than the sum of its proper divisors (1).

81270847249 is an equidigital number, since it uses as much as digits as its factorization.

81270847249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 81270847249 in words is "eighty-one billion, two hundred seventy million, eight hundred forty-seven thousand, two hundred forty-nine".