865101561 has 8 divisors (see below), whose sum is σ = 1153805184. Its totient is φ = 576566160.

The previous prime is 865101539. The next prime is 865101571. The reversal of 865101561 is 165101568.

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

It is not a de Polignac number, because 865101561 - 2⁵ = 865101529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865101571) 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, 29521 + ... + 51006.

It is an arithmetic number, because the mean of its divisors is an integer number (144225648).

Almost surely, 2^865101561 is an apocalyptic number.

It is an amenable number.

865101561 is a deficient number, since it is larger than the sum of its proper divisors (288703623).

865101561 is a wasteful number, since it uses less digits than its factorization.

865101561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84111.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 865101561 is about 29412.6088778265. The cubic root of 865101561 is about 952.8452322178.

The spelling of 865101561 in words is "eight hundred sixty-five million, one hundred one thousand, five hundred sixty-one".