1387276843721 has 2 divisors, whose sum is σ = 1387276843722. Its totient is φ = 1387276843720.

The previous prime is 1387276843643. The next prime is 1387276843727. The reversal of 1387276843721 is 1273486727831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 781922821696 + 605354022025 = 884264^2 + 778045^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387276843721 - 2³⁰ = 1386203101897 is a prime.

It is a super-2 number, since 2×1387276843721² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1387276843727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693638421860 + 693638421861.

It is an arithmetic number, because the mean of its divisors is an integer number (693638421861).

Almost surely, 2^{1387276843721} is an apocalyptic number.

It is an amenable number.

1387276843721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387276843721 is an equidigital number, since it uses as much as digits as its factorization.

1387276843721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18966528, while the sum is 59.

The spelling of 1387276843721 in words is "one trillion, three hundred eighty-seven billion, two hundred seventy-six million, eight hundred forty-three thousand, seven hundred twenty-one".