10115561 has 16 divisors (see below), whose sum is σ = 11467008. Its totient is φ = 8870400.

The previous prime is 10115557. The next prime is 10115563. The reversal of 10115561 is 16551101.

It is a cyclic number.

It is not a de Polignac number, because 10115561 - 2² = 10115557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10115563) 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 15 ways as a sum of consecutive naturals, for example, 15716 + ... + 16346.

It is an arithmetic number, because the mean of its divisors is an integer number (716688).

Almost surely, 2^10115561 is an apocalyptic number.

It is an amenable number.

10115561 is a deficient number, since it is larger than the sum of its proper divisors (1351447).

10115561 is a wasteful number, since it uses less digits than its factorization.

10115561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 10115561 is about 3180.4969737448. The cubic root of 10115561 is about 216.2701880092.

Adding to 10115561 its reverse (16551101), we get a palindrome (26666662).

The spelling of 10115561 in words is "ten million, one hundred fifteen thousand, five hundred sixty-one".