10861561 has 4 divisors (see below), whose sum is σ = 10884352. Its totient is φ = 10838772.

The previous prime is 10861549. The next prime is 10861567. The reversal of 10861561 is 16516801.

10861561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10861561 - 2⁹ = 10861049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10861567) 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, 10665 + ... + 11638.

It is an arithmetic number, because the mean of its divisors is an integer number (2721088).

Almost surely, 2^10861561 is an apocalyptic number.

It is an amenable number.

10861561 is a deficient number, since it is larger than the sum of its proper divisors (22791).

10861561 is an equidigital number, since it uses as much as digits as its factorization.

10861561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22790.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 10861561 is about 3295.6882437512. The cubic root of 10861561 is about 221.4610808618.

The spelling of 10861561 in words is "ten million, eight hundred sixty-one thousand, five hundred sixty-one".