8513561081 has 8 divisors (see below), whose sum is σ = 8635161024. Its totient is φ = 8392008240.

The previous prime is 8513561041. The next prime is 8513561083. The reversal of 8513561081 is 1801653158.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8513561081 is a prime.

It is a super-2 number, since 2×8513561081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8513561083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525011 + ... + 540983.

It is an arithmetic number, because the mean of its divisors is an integer number (1079395128).

Almost surely, 2^8513561081 is an apocalyptic number.

It is an amenable number.

8513561081 is a deficient number, since it is larger than the sum of its proper divisors (121599943).

8513561081 is a wasteful number, since it uses less digits than its factorization.

8513561081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23551.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 8513561081 is about 92268.9605501222. The cubic root of 8513561081 is about 2041.9123008628.

The spelling of 8513561081 in words is "eight billion, five hundred thirteen million, five hundred sixty-one thousand, eighty-one".