27081561 has 16 divisors (see below), whose sum is σ = 41174784. Its totient is φ = 15684864.

The previous prime is 27081559. The next prime is 27081589. The reversal of 27081561 is 16518072.

It is not a de Polignac number, because 27081561 - 2¹ = 27081559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27085561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19761 + ... + 21086.

It is an arithmetic number, because the mean of its divisors is an integer number (2573424).

Almost surely, 2^27081561 is an apocalyptic number.

It is an amenable number.

27081561 is a deficient number, since it is larger than the sum of its proper divisors (14093223).

27081561 is a wasteful number, since it uses less digits than its factorization.

27081561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40880.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 27081561 is about 5203.9947156007. The cubic root of 27081561 is about 300.3017741173.

The spelling of 27081561 in words is "twenty-seven million, eighty-one thousand, five hundred sixty-one".