388149760781 has 2 divisors, whose sum is σ = 388149760782. Its totient is φ = 388149760780.

The previous prime is 388149760777. The next prime is 388149760793. The reversal of 388149760781 is 187067941883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247456502500 + 140693258281 = 497450^2 + 375091^2 .

It is a cyclic number.

It is not a de Polignac number, because 388149760781 - 2² = 388149760777 is a prime.

It is a super-2 number, since 2×388149760781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388140760781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194074880390 + 194074880391.

It is an arithmetic number, because the mean of its divisors is an integer number (194074880391).

Almost surely, 2^388149760781 is an apocalyptic number.

It is an amenable number.

388149760781 is a deficient number, since it is larger than the sum of its proper divisors (1).

388149760781 is an equidigital number, since it uses as much as digits as its factorization.

388149760781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16257024, while the sum is 62.

The spelling of 388149760781 in words is "three hundred eighty-eight billion, one hundred forty-nine million, seven hundred sixty thousand, seven hundred eighty-one".