27305161 has 6 divisors (see below), whose sum is σ = 29567310. Its totient is φ = 25204608.

The previous prime is 27305137. The next prime is 27305171. The reversal of 27305161 is 16150372.

It can be written as a sum of positive squares in 3 ways, for example, as 462400 + 26842761 = 680^2 + 5181^2 .

It is not a de Polignac number, because 27305161 - 2¹⁵ = 27272393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27305101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 80616 + ... + 80953.

It is an arithmetic number, because the mean of its divisors is an integer number (4927885).

Almost surely, 2^27305161 is an apocalyptic number.

It is an amenable number.

27305161 is a deficient number, since it is larger than the sum of its proper divisors (2262149).

27305161 is a wasteful number, since it uses less digits than its factorization.

27305161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161595 (or 161582 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 27305161 is about 5225.4340489571. The cubic root of 27305161 is about 301.1259944270.

The spelling of 27305161 in words is "twenty-seven million, three hundred five thousand, one hundred sixty-one".