27161261 has 4 divisors (see below), whose sum is σ = 27441372. Its totient is φ = 26881152.

The previous prime is 27161249. The next prime is 27161327. The reversal of 27161261 is 16216172.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11519236 + 15642025 = 3394^2 + 3955^2 .

It is a cyclic number.

It is not a de Polignac number, because 27161261 - 2¹⁴ = 27144877 is a prime.

It is a super-2 number, since 2×27161261² = 1475468198220242, which contains 22 as substring.

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 27161261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27161861) 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, 139910 + ... + 140103.

It is an arithmetic number, because the mean of its divisors is an integer number (6860343).

Almost surely, 2^27161261 is an apocalyptic number.

It is an amenable number.

27161261 is a deficient number, since it is larger than the sum of its proper divisors (280111).

27161261 is an equidigital number, since it uses as much as digits as its factorization.

27161261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280110.

The product of its digits is 1008, while the sum is 26.

The square root of 27161261 is about 5211.6466687603. The cubic root of 27161261 is about 300.5960778160.

The spelling of 27161261 in words is "twenty-seven million, one hundred sixty-one thousand, two hundred sixty-one".