388344731321 has 2 divisors, whose sum is σ = 388344731322. Its totient is φ = 388344731320.

The previous prime is 388344731287. The next prime is 388344731503. The reversal of 388344731321 is 123137443883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318587998096 + 69756733225 = 564436^2 + 264115^2 .

It is a cyclic number.

It is not a de Polignac number, because 388344731321 - 2¹⁰ = 388344730297 is a prime.

It is not a weakly prime, because it can be changed into another prime (388344731221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194172365660 + 194172365661.

It is an arithmetic number, because the mean of its divisors is an integer number (194172365661).

Almost surely, 2^388344731321 is an apocalyptic number.

It is an amenable number.

388344731321 is a deficient number, since it is larger than the sum of its proper divisors (1).

388344731321 is an equidigital number, since it uses as much as digits as its factorization.

388344731321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 47.

The spelling of 388344731321 in words is "three hundred eighty-eight billion, three hundred forty-four million, seven hundred thirty-one thousand, three hundred twenty-one".