1387867364621 has 2 divisors, whose sum is σ = 1387867364622. Its totient is φ = 1387867364620.

The previous prime is 1387867364617. The next prime is 1387867364647. The reversal of 1387867364621 is 1264637687831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1346226472900 + 41640891721 = 1160270^2 + 204061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387867364621 - 2² = 1387867364617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387867384621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693933682310 + 693933682311.

It is an arithmetic number, because the mean of its divisors is an integer number (693933682311).

Almost surely, 2^{1387867364621} is an apocalyptic number.

It is an amenable number.

1387867364621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387867364621 is an equidigital number, since it uses as much as digits as its factorization.

1387867364621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48771072, while the sum is 62.

The spelling of 1387867364621 in words is "one trillion, three hundred eighty-seven billion, eight hundred sixty-seven million, three hundred sixty-four thousand, six hundred twenty-one".