27217009 has 4 divisors (see below), whose sum is σ = 27235440. Its totient is φ = 27198580.

The previous prime is 27216997. The next prime is 27217019. The reversal of 27217009 is 90071272.

It is a happy number.

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 27217009 - 2¹⁷ = 27085937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27217019) 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, 6787 + ... + 10024.

It is an arithmetic number, because the mean of its divisors is an integer number (6808860).

Almost surely, 2^27217009 is an apocalyptic number.

It is an amenable number.

27217009 is a deficient number, since it is larger than the sum of its proper divisors (18431).

27217009 is a wasteful number, since it uses less digits than its factorization.

27217009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18430.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 27217009 is about 5216.9923327527. The cubic root of 27217009 is about 300.8015932900.

It can be divided in two parts, 2721 and 7009, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 27217009 in words is "twenty-seven million, two hundred seventeen thousand, nine".