1068051781 has 4 divisors (see below), whose sum is σ = 1069434252. Its totient is φ = 1066669312.

The previous prime is 1068051749. The next prime is 1068051799. The reversal of 1068051781 is 1871508601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 491331556 + 576720225 = 22166^2 + 24015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1068051781 - 2⁵ = 1068051749 is a prime.

It is a super-2 number, since 2×1068051781² = 2281469213794543922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1068051781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1068051581) 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 in 3 ways as a sum of consecutive naturals, for example, 690076 + ... + 691621.

It is an arithmetic number, because the mean of its divisors is an integer number (267358563).

Almost surely, 2^1068051781 is an apocalyptic number.

It is an amenable number.

1068051781 is a deficient number, since it is larger than the sum of its proper divisors (1382471).

1068051781 is an equidigital number, since it uses as much as digits as its factorization.

1068051781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382470.

The product of its (nonzero) digits is 13440, while the sum is 37.

The square root of 1068051781 is about 32681.0615035681. The cubic root of 1068051781 is about 1022.1879794719.

The spelling of 1068051781 in words is "one billion, sixty-eight million, fifty-one thousand, seven hundred eighty-one".