81381241124 has 6 divisors (see below), whose sum is σ = 142417171974. Its totient is φ = 40690620560.

The previous prime is 81381241103. The next prime is 81381241133. The reversal of 81381241124 is 42114218318.

It can be written as a sum of positive squares in only one way, i.e., 46669825024 + 34711416100 = 216032^2 + 186310^2 .

It is an unprimeable number.

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, 10172655137 + ... + 10172655144.

It is an arithmetic number, because the mean of its divisors is an integer number (23736195329).

Almost surely, 2^81381241124 is an apocalyptic number.

It is an amenable number.

81381241124 is a deficient number, since it is larger than the sum of its proper divisors (61035930850).

81381241124 is a wasteful number, since it uses less digits than its factorization.

81381241124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20345310285 (or 20345310283 counting only the distinct ones).

The product of its digits is 12288, while the sum is 35.

The spelling of 81381241124 in words is "eighty-one billion, three hundred eighty-one million, two hundred forty-one thousand, one hundred twenty-four".