38871257981 has 4 divisors (see below), whose sum is σ = 38940301632. Its totient is φ = 38802214332.

The previous prime is 38871257969. The next prime is 38871258001. The reversal of 38871257981 is 18975217883.

38871257981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 38871257981 - 2⁶ = 38871257917 is a prime.

It is a super-2 number, since 2×38871257981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38871257981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38871257921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34520981 + ... + 34522106.

It is an arithmetic number, because the mean of its divisors is an integer number (9735075408).

Almost surely, 2^38871257981 is an apocalyptic number.

It is an amenable number.

38871257981 is a deficient number, since it is larger than the sum of its proper divisors (69043651).

38871257981 is an equidigital number, since it uses as much as digits as its factorization.

38871257981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69043650.

The product of its digits is 6773760, while the sum is 59.

The spelling of 38871257981 in words is "thirty-eight billion, eight hundred seventy-one million, two hundred fifty-seven thousand, nine hundred eighty-one".