1928438975231 has 4 divisors (see below), whose sum is σ = 1928828013672. Its totient is φ = 1928049936792.

The previous prime is 1928438975219. The next prime is 1928438975261. The reversal of 1928438975231 is 1325798348291.

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 1928438975231 - 2¹⁰ = 1928438974207 is a prime.

It is a super-2 number, since 2×1928438975231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1928438975201) 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, 194511785 + ... + 194521698.

It is an arithmetic number, because the mean of its divisors is an integer number (482207003418).

Almost surely, 2^{1928438975231} is an apocalyptic number.

1928438975231 is a deficient number, since it is larger than the sum of its proper divisors (389038441).

1928438975231 is an equidigital number, since it uses as much as digits as its factorization.

1928438975231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389038440.

The product of its digits is 26127360, while the sum is 62.

The spelling of 1928438975231 in words is "one trillion, nine hundred twenty-eight billion, four hundred thirty-eight million, nine hundred seventy-five thousand, two hundred thirty-one".