1068140561 has 4 divisors (see below), whose sum is σ = 1085651124. Its totient is φ = 1050630000.

The previous prime is 1068140533. The next prime is 1068140581. The reversal of 1068140561 is 1650418601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1650418601 = 13 ⋅126955277.

It can be written as a sum of positive squares in 2 ways, for example, as 484000000 + 584140561 = 22000^2 + 24169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1068140561 - 2⁶ = 1068140497 is a prime.

It is a super-2 number, since 2×1068140561² = 2281848516106789442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1068140581) 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, 8755190 + ... + 8755311.

It is an arithmetic number, because the mean of its divisors is an integer number (271412781).

Almost surely, 2^1068140561 is an apocalyptic number.

It is an amenable number.

1068140561 is a deficient number, since it is larger than the sum of its proper divisors (17510563).

1068140561 is an equidigital number, since it uses as much as digits as its factorization.

1068140561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17510562.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 1068140561 is about 32682.4197543572. The cubic root of 1068140561 is about 1022.2163012369.

The spelling of 1068140561 in words is "one billion, sixty-eight million, one hundred forty thousand, five hundred sixty-one".