27172009 has 2 divisors, whose sum is σ = 27172010. Its totient is φ = 27172008.

The previous prime is 27172003. The next prime is 27172099. The reversal of 27172009 is 90027172.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22353984 + 4818025 = 4728^2 + 2195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27172009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27172003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13586004 + 13586005.

It is an arithmetic number, because the mean of its divisors is an integer number (13586005).

Almost surely, 2^27172009 is an apocalyptic number.

It is an amenable number.

27172009 is a deficient number, since it is larger than the sum of its proper divisors (1).

27172009 is an equidigital number, since it uses as much as digits as its factorization.

27172009 is an evil number, because the sum of its binary digits is even.

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

The square root of 27172009 is about 5212.6777187929. The cubic root of 27172009 is about 300.6357222761.

The spelling of 27172009 in words is "twenty-seven million, one hundred seventy-two thousand, nine".