38243358781 has 2 divisors, whose sum is σ = 38243358782. Its totient is φ = 38243358780.

The previous prime is 38243358773. The next prime is 38243358833. The reversal of 38243358781 is 18785334283.

It is an a-pointer prime, because the next prime (38243358833) can be obtained adding 38243358781 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30814642681 + 7428716100 = 175541^2 + 86190^2 .

It is a cyclic number.

It is not a de Polignac number, because 38243358781 - 2³ = 38243358773 is a prime.

It is a super-2 number, since 2×38243358781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38243350781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19121679390 + 19121679391.

It is an arithmetic number, because the mean of its divisors is an integer number (19121679391).

Almost surely, 2^38243358781 is an apocalyptic number.

It is an amenable number.

38243358781 is a deficient number, since it is larger than the sum of its proper divisors (1).

38243358781 is an equidigital number, since it uses as much as digits as its factorization.

38243358781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 52.

The spelling of 38243358781 in words is "thirty-eight billion, two hundred forty-three million, three hundred fifty-eight thousand, seven hundred eighty-one".