387391128781 has 2 divisors, whose sum is σ = 387391128782. Its totient is φ = 387391128780.

The previous prime is 387391128703. The next prime is 387391128791. The reversal of 387391128781 is 187821193783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295723878025 + 91667250756 = 543805^2 + 302766^2 .

It is a cyclic number.

It is not a de Polignac number, because 387391128781 - 2¹⁷ = 387390997709 is a prime.

It is a super-2 number, since 2×387391128781² (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 (387391128791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193695564390 + 193695564391.

It is an arithmetic number, because the mean of its divisors is an integer number (193695564391).

Almost surely, 2^387391128781 is an apocalyptic number.

It is an amenable number.

387391128781 is a deficient number, since it is larger than the sum of its proper divisors (1).

387391128781 is an equidigital number, since it uses as much as digits as its factorization.

387391128781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 58.

The spelling of 387391128781 in words is "three hundred eighty-seven billion, three hundred ninety-one million, one hundred twenty-eight thousand, seven hundred eighty-one".