938543421851 has 4 divisors (see below), whose sum is σ = 1072621053552. Its totient is φ = 804465790152.

The previous prime is 938543421847. The next prime is 938543421931. The reversal of 938543421851 is 158124345839.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158124345839 = 351059 ⋅450421.

It is a cyclic number.

It is not a de Polignac number, because 938543421851 - 2² = 938543421847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 938543421793 and 938543421802.

It is not an unprimeable number, because it can be changed into a prime (938543411851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67038815840 + ... + 67038815853.

It is an arithmetic number, because the mean of its divisors is an integer number (268155263388).

Almost surely, 2^938543421851 is an apocalyptic number.

938543421851 is a deficient number, since it is larger than the sum of its proper divisors (134077631701).

938543421851 is a wasteful number, since it uses less digits than its factorization.

938543421851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134077631700.

The product of its digits is 4147200, while the sum is 53.

The spelling of 938543421851 in words is "nine hundred thirty-eight billion, five hundred forty-three million, four hundred twenty-one thousand, eight hundred fifty-one".