1928373818281 has 3 divisors (see below), whose sum is σ = 1928375206941. Its totient is φ = 1928372429622.

The previous prime is 1928373818279. The next prime is 1928373818311. The reversal of 1928373818281 is 1828183738291.

The square root of 1928373818281 is 1388659.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1928373818281 - 2¹ = 1928373818279 is a prime.

It is a super-2 number, since 2×1928373818281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1928373848281) 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 2 ways as a sum of consecutive naturals, for example, 694330 + ... + 2082988.

It is an arithmetic number, because the mean of its divisors is an integer number (642791735647).

Almost surely, 2^{1928373818281} is an apocalyptic number.

1928373818281 is the 1388659-th square number.

1928373818281 is the 694330-th centered octagonal number.

It is an amenable number.

1928373818281 is a deficient number, since it is larger than the sum of its proper divisors (1388660).

1928373818281 is an frugal number, since it uses more digits than its factorization.

1928373818281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777318 (or 1388659 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 61.

The spelling of 1928373818281 in words is "one trillion, nine hundred twenty-eight billion, three hundred seventy-three million, eight hundred eighteen thousand, two hundred eighty-one".