1928718881 has 2 divisors, whose sum is σ = 1928718882. Its totient is φ = 1928718880.

The previous prime is 1928718839. The next prime is 1928718907. The reversal of 1928718881 is 1888178291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1427630656 + 501088225 = 37784^2 + 22385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1928718881 is a prime.

It is a super-2 number, since 2×1928718881² = 7439913043851784322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1928718821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964359440 + 964359441.

It is an arithmetic number, because the mean of its divisors is an integer number (964359441).

Almost surely, 2^1928718881 is an apocalyptic number.

It is an amenable number.

1928718881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928718881 is an equidigital number, since it uses as much as digits as its factorization.

1928718881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 53.

The square root of 1928718881 is about 43917.1820703469. The cubic root of 1928718881 is about 1244.7715221877.

The spelling of 1928718881 in words is "one billion, nine hundred twenty-eight million, seven hundred eighteen thousand, eight hundred eighty-one".