27561043 has 4 divisors (see below), whose sum is σ = 27578880. Its totient is φ = 27543208.

The previous prime is 27561019. The next prime is 27561047. The reversal of 27561043 is 34016572.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27561043 - 2⁵ = 27561011 is a prime.

It is a super-2 number, since 2×27561043² = 1519222182495698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27561047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6355 + ... + 9772.

It is an arithmetic number, because the mean of its divisors is an integer number (6894720).

Almost surely, 2^27561043 is an apocalyptic number.

27561043 is a deficient number, since it is larger than the sum of its proper divisors (17837).

27561043 is a wasteful number, since it uses less digits than its factorization.

27561043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17836.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 27561043 is about 5249.8612362614. The cubic root of 27561043 is about 302.0637081799.

It can be divided in two parts, 275610 and 43, that added together give a triangular number (275653 = T₇₄₂).

The spelling of 27561043 in words is "twenty-seven million, five hundred sixty-one thousand, forty-three".