111538038520171 has 4 divisors (see below), whose sum is σ = 117408461600200. Its totient is φ = 105667615440144.

The previous prime is 111538038520147. The next prime is 111538038520229. The reversal of 111538038520171 is 171025830835111.

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 111538038520171 - 2²¹ = 111538036423019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111538038520141) 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, 2935211539986 + ... + 2935211540023.

It is an arithmetic number, because the mean of its divisors is an integer number (29352115400050).

Almost surely, 2^{111538038520171} is an apocalyptic number.

111538038520171 is a deficient number, since it is larger than the sum of its proper divisors (5870423080029).

111538038520171 is an equidigital number, since it uses as much as digits as its factorization.

111538038520171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5870423080028.

The product of its (nonzero) digits is 201600, while the sum is 46.

The spelling of 111538038520171 in words is "one hundred eleven trillion, five hundred thirty-eight billion, thirty-eight million, five hundred twenty thousand, one hundred seventy-one".