12481281081 has 6 divisors (see below), whose sum is σ = 18028517130. Its totient is φ = 8320854048.

The previous prime is 12481281047. The next prime is 12481281091. The reversal of 12481281081 is 18018218421.

It can be written as a sum of positive squares in only one way, i.e., 11767910400 + 713370681 = 108480^2 + 26709^2 .

It is not a de Polignac number, because 12481281081 - 2¹³ = 12481272889 is a prime.

It is a super-2 number, since 2×12481281081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12481281041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 693404496 + ... + 693404513.

It is an arithmetic number, because the mean of its divisors is an integer number (3004752855).

Almost surely, 2^12481281081 is an apocalyptic number.

It is an amenable number.

12481281081 is a deficient number, since it is larger than the sum of its proper divisors (5547236049).

12481281081 is a wasteful number, since it uses less digits than its factorization.

12481281081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386809015 (or 1386809012 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The spelling of 12481281081 in words is "twelve billion, four hundred eighty-one million, two hundred eighty-one thousand, eighty-one".