8561216249 has 16 divisors (see below), whose sum is σ = 8802763200. Its totient is φ = 8323375104.

The previous prime is 8561216231. The next prime is 8561216263. The reversal of 8561216249 is 9426121658.

It is a cyclic number.

It is not a de Polignac number, because 8561216249 - 2²⁰ = 8560167673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8561216449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4584614 + ... + 4586480.

It is an arithmetic number, because the mean of its divisors is an integer number (550172700).

Almost surely, 2^8561216249 is an apocalyptic number.

8561216249 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

8561216249 is a deficient number, since it is larger than the sum of its proper divisors (241546951).

8561216249 is a wasteful number, since it uses less digits than its factorization.

8561216249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2792.

The product of its digits is 207360, while the sum is 44.

The square root of 8561216249 is about 92526.8406950113. The cubic root of 8561216249 is about 2045.7151229520.

The spelling of 8561216249 in words is "eight billion, five hundred sixty-one million, two hundred sixteen thousand, two hundred forty-nine".