27191641 has 4 divisors (see below), whose sum is σ = 28622800. Its totient is φ = 25760484.

The previous prime is 27191639. The next prime is 27191693. The reversal of 27191641 is 14619172.

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 27191641 - 2¹ = 27191639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27191611) 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, 715551 + ... + 715588.

It is an arithmetic number, because the mean of its divisors is an integer number (7155700).

Almost surely, 2^27191641 is an apocalyptic number.

It is an amenable number.

27191641 is a deficient number, since it is larger than the sum of its proper divisors (1431159).

27191641 is a wasteful number, since it uses less digits than its factorization.

27191641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431158.

The product of its digits is 3024, while the sum is 31.

The square root of 27191641 is about 5214.5604800405. The cubic root of 27191641 is about 300.7081087730.

The spelling of 27191641 in words is "twenty-seven million, one hundred ninety-one thousand, six hundred forty-one".