38086121991 has 4 divisors (see below), whose sum is σ = 50781495992. Its totient is φ = 25390747992.

The previous prime is 38086121873. The next prime is 38086122031. The reversal of 38086121991 is 19912168083.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19912168083 = 3 ⋅6637389361.

It is not a de Polignac number, because 38086121991 - 2¹⁰ = 38086120967 is a prime.

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 38086121991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38086121191) 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, 6347686996 + ... + 6347687001.

It is an arithmetic number, because the mean of its divisors is an integer number (12695373998).

Almost surely, 2^38086121991 is an apocalyptic number.

38086121991 is a deficient number, since it is larger than the sum of its proper divisors (12695374001).

38086121991 is a wasteful number, since it uses less digits than its factorization.

38086121991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12695374000.

The product of its (nonzero) digits is 186624, while the sum is 48.

The spelling of 38086121991 in words is "thirty-eight billion, eighty-six million, one hundred twenty-one thousand, nine hundred ninety-one".