8601581861 has 4 divisors (see below), whose sum is σ = 8618820000. Its totient is φ = 8584343724.

The previous prime is 8601581819. The next prime is 8601581867. The reversal of 8601581861 is 1681851068.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8601581861 is a prime.

It is a super-2 number, since 2×8601581861² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8601581867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8618321 + ... + 8619318.

It is an arithmetic number, because the mean of its divisors is an integer number (2154705000).

Almost surely, 2^8601581861 is an apocalyptic number.

It is an amenable number.

8601581861 is a deficient number, since it is larger than the sum of its proper divisors (17238139).

8601581861 is a wasteful number, since it uses less digits than its factorization.

8601581861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17238138.

The product of its (nonzero) digits is 92160, while the sum is 44.

The square root of 8601581861 is about 92744.7133857235. The cubic root of 8601581861 is about 2048.9252237244.

The spelling of 8601581861 in words is "eight billion, six hundred one million, five hundred eighty-one thousand, eight hundred sixty-one".