27781151 has 4 divisors (see below), whose sum is σ = 27791832. Its totient is φ = 27770472.

The previous prime is 27781133. The next prime is 27781181. The reversal of 27781151 is 15118772.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 27781151 - 2⁶ = 27781087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27781181) 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, 1385 + ... + 7581.

It is an arithmetic number, because the mean of its divisors is an integer number (6947958).

Almost surely, 2^27781151 is an apocalyptic number.

27781151 is a deficient number, since it is larger than the sum of its proper divisors (10681).

27781151 is an equidigital number, since it uses as much as digits as its factorization.

27781151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10680.

The product of its digits is 3920, while the sum is 32.

The square root of 27781151 is about 5270.7827691909. The cubic root of 27781151 is about 302.8656907456.

The spelling of 27781151 in words is "twenty-seven million, seven hundred eighty-one thousand, one hundred fifty-one".