1387276843681 has 4 divisors (see below), whose sum is σ = 1393851615664. Its totient is φ = 1380702071700.

The previous prime is 1387276843643. The next prime is 1387276843721. The reversal of 1387276843681 is 1863486727831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1387276843681 - 2¹⁹ = 1387276319393 is a prime.

It is a super-2 number, since 2×1387276843681² (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 (1387276843081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3287385675 + ... + 3287386096.

It is an arithmetic number, because the mean of its divisors is an integer number (348462903916).

Almost surely, 2^{1387276843681} is an apocalyptic number.

It is an amenable number.

1387276843681 is a deficient number, since it is larger than the sum of its proper divisors (6574771983).

1387276843681 is an equidigital number, since it uses as much as digits as its factorization.

1387276843681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6574771982.

The product of its digits is 65028096, while the sum is 64.

The spelling of 1387276843681 in words is "one trillion, three hundred eighty-seven billion, two hundred seventy-six million, eight hundred forty-three thousand, six hundred eighty-one".