8115561 has 12 divisors (see below), whose sum is σ = 11767860. Its totient is φ = 5389440.

The previous prime is 8115557. The next prime is 8115571. The reversal of 8115561 is 1655118.

It can be written as a sum of positive squares in 2 ways, for example, as 5035536 + 3080025 = 2244^2 + 1755^2 .

It is not a de Polignac number, because 8115561 - 2² = 8115557 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8115551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 925 + ... + 4133.

It is an arithmetic number, because the mean of its divisors is an integer number (980655).

Almost surely, 2^8115561 is an apocalyptic number.

It is an amenable number.

8115561 is a deficient number, since it is larger than the sum of its proper divisors (3652299).

8115561 is a wasteful number, since it uses less digits than its factorization.

8115561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3496 (or 3493 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 8115561 is about 2848.7823714703. The cubic root of 8115561 is about 200.9584082651.

The spelling of 8115561 in words is "eight million, one hundred fifteen thousand, five hundred sixty-one".