1781060881 has 2 divisors, whose sum is σ = 1781060882. Its totient is φ = 1781060880.

The previous prime is 1781060863. The next prime is 1781060891. The reversal of 1781060881 is 1880601871.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1247219856 + 533841025 = 35316^2 + 23105^2 .

It is a cyclic number.

It is not a de Polignac number, because 1781060881 - 2⁷ = 1781060753 is a prime.

It is a super-3 number, since 3×1781060881³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1781060861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890530440 + 890530441.

It is an arithmetic number, because the mean of its divisors is an integer number (890530441).

Almost surely, 2^1781060881 is an apocalyptic number.

It is an amenable number.

1781060881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1781060881 is an equidigital number, since it uses as much as digits as its factorization.

1781060881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 40.

The square root of 1781060881 is about 42202.6169923146. The cubic root of 1781060881 is about 1212.1589942800.

The spelling of 1781060881 in words is "one billion, seven hundred eighty-one million, sixty thousand, eight hundred eighty-one".