7859561 has 4 divisors (see below), whose sum is σ = 7865172. Its totient is φ = 7853952.

The previous prime is 7859549. The next prime is 7859573. The reversal of 7859561 is 1659587.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (7859549) and next prime (7859573).

It can be written as a sum of positive squares in 2 ways, for example, as 4818025 + 3041536 = 2195^2 + 1744^2 .

It is a cyclic number.

It is not a de Polignac number, because 7859561 - 2¹⁰ = 7858537 is a prime.

It is a super-2 number, since 2×7859561² = 123545398225442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7859531) 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, 1265 + ... + 4161.

It is an arithmetic number, because the mean of its divisors is an integer number (1966293).

Almost surely, 2^7859561 is an apocalyptic number.

It is an amenable number.

7859561 is a deficient number, since it is larger than the sum of its proper divisors (5611).

7859561 is a wasteful number, since it uses less digits than its factorization.

7859561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5610.

The product of its digits is 75600, while the sum is 41.

The square root of 7859561 is about 2803.4908596248. The cubic root of 7859561 is about 198.8227591156.

The spelling of 7859561 in words is "seven million, eight hundred fifty-nine thousand, five hundred sixty-one".