1001120000861 has 2 divisors, whose sum is σ = 1001120000862. Its totient is φ = 1001120000860.

The previous prime is 1001120000851. The next prime is 1001120000891. The reversal of 1001120000861 is 1680000211001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 841863135961 + 159256864900 = 917531^2 + 399070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001120000861 is a prime.

It is a super-2 number, since 2×1001120000861² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001120000851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500560000430 + 500560000431.

It is an arithmetic number, because the mean of its divisors is an integer number (500560000431).

Almost surely, 2^{1001120000861} is an apocalyptic number.

It is an amenable number.

1001120000861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001120000861 is an equidigital number, since it uses as much as digits as its factorization.

1001120000861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1001120000861 its reverse (1680000211001), we get a palindrome (2681120211862).

The spelling of 1001120000861 in words is "one trillion, one billion, one hundred twenty million, eight hundred sixty-one", and thus it is an aban number.