27801161 has 4 divisors (see below), whose sum is σ = 29264400. Its totient is φ = 26337924.

The previous prime is 27801143. The next prime is 27801167. The reversal of 27801161 is 16110872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27801161 - 2¹⁰ = 27800137 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 27801161.

It is not an unprimeable number, because it can be changed into a prime (27801167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731591 + ... + 731628.

It is an arithmetic number, because the mean of its divisors is an integer number (7316100).

Almost surely, 2^27801161 is an apocalyptic number.

It is an amenable number.

27801161 is a deficient number, since it is larger than the sum of its proper divisors (1463239).

27801161 is a wasteful number, since it uses less digits than its factorization.

27801161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463238.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 27801161 is about 5272.6806275366. The cubic root of 27801161 is about 302.9383885737.

The spelling of 27801161 in words is "twenty-seven million, eight hundred one thousand, one hundred sixty-one".