538917205891 has 4 divisors (see below), whose sum is σ = 538985839392. Its totient is φ = 538848572392.

The previous prime is 538917205889. The next prime is 538917205919. The reversal of 538917205891 is 198502719835.

It is a happy number.

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 538917205891 - 2¹ = 538917205889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538917205391) 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, 34304971 + ... + 34320676.

It is an arithmetic number, because the mean of its divisors is an integer number (134746459848).

Almost surely, 2^538917205891 is an apocalyptic number.

538917205891 is a deficient number, since it is larger than the sum of its proper divisors (68633501).

538917205891 is an equidigital number, since it uses as much as digits as its factorization.

538917205891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68633500.

The product of its (nonzero) digits is 5443200, while the sum is 58.

The spelling of 538917205891 in words is "five hundred thirty-eight billion, nine hundred seventeen million, two hundred five thousand, eight hundred ninety-one".