1081566613 has 4 divisors (see below), whose sum is σ = 1096382668. Its totient is φ = 1066750560.

The previous prime is 1081566599. The next prime is 1081566623. The reversal of 1081566613 is 3166651801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3166651801 = 4271 ⋅741431.

It can be written as a sum of positive squares in 2 ways, for example, as 639179524 + 442387089 = 25282^2 + 21033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081566613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081566623) 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, 7407918 + ... + 7408063.

It is an arithmetic number, because the mean of its divisors is an integer number (274095667).

Almost surely, 2^1081566613 is an apocalyptic number.

It is an amenable number.

1081566613 is a deficient number, since it is larger than the sum of its proper divisors (14816055).

1081566613 is an equidigital number, since it uses as much as digits as its factorization.

1081566613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14816054.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1081566613 is about 32887.1800706598. The cubic root of 1081566613 is about 1026.4814154683.

The spelling of 1081566613 in words is "one billion, eighty-one million, five hundred sixty-six thousand, six hundred thirteen".