38885731991 has 4 divisors (see below), whose sum is σ = 38991688032. Its totient is φ = 38779775952.

The previous prime is 38885731979. The next prime is 38885732009. The reversal of 38885731991 is 19913758883.

38885731991 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.

It is a cyclic number.

It is not a de Polignac number, because 38885731991 - 2¹⁰ = 38885730967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38885731691) 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, 52977470 + ... + 52978203.

It is an arithmetic number, because the mean of its divisors is an integer number (9747922008).

Almost surely, 2^38885731991 is an apocalyptic number.

38885731991 is a deficient number, since it is larger than the sum of its proper divisors (105956041).

38885731991 is a wasteful number, since it uses less digits than its factorization.

38885731991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105956040.

The product of its digits is 13063680, while the sum is 62.

The spelling of 38885731991 in words is "thirty-eight billion, eight hundred eighty-five million, seven hundred thirty-one thousand, nine hundred ninety-one".