1381608979281 has 6 divisors (see below), whose sum is σ = 1995657414530. Its totient is φ = 921072652848.

The previous prime is 1381608979277. The next prime is 1381608979319. The reversal of 1381608979281 is 1829798061831.

1381608979281 is a `hidden beast` number, since 1 + 381 + 6 + 0 + 8 + 97 + 92 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 985453290000 + 396155689281 = 992700^2 + 629409^2 .

It is not a de Polignac number, because 1381608979281 - 2² = 1381608979277 is a prime.

It is a super-2 number, since 2×1381608979281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381608979271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76756054396 + ... + 76756054413.

Almost surely, 2^{1381608979281} is an apocalyptic number.

It is an amenable number.

1381608979281 is a deficient number, since it is larger than the sum of its proper divisors (614048435249).

1381608979281 is a wasteful number, since it uses less digits than its factorization.

1381608979281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153512108815 (or 153512108812 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 1381608979281 in words is "one trillion, three hundred eighty-one billion, six hundred eight million, nine hundred seventy-nine thousand, two hundred eighty-one".