27156961 has 16 divisors (see below), whose sum is σ = 30607360. Its totient is φ = 23924160.

The previous prime is 27156959. The next prime is 27156967. The reversal of 27156961 is 16965172.

It is not a de Polignac number, because 27156961 - 2¹ = 27156959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27156961.

It is not an unprimeable number, because it can be changed into a prime (27156967) 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, 31411 + ... + 32263.

It is an arithmetic number, because the mean of its divisors is an integer number (1912960).

Almost surely, 2^27156961 is an apocalyptic number.

It is an amenable number.

27156961 is a deficient number, since it is larger than the sum of its proper divisors (3450399).

27156961 is a wasteful number, since it uses less digits than its factorization.

27156961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

The product of its digits is 22680, while the sum is 37.

The square root of 27156961 is about 5211.2341148714. The cubic root of 27156961 is about 300.5802141521.

The spelling of 27156961 in words is "twenty-seven million, one hundred fifty-six thousand, nine hundred sixty-one".