27121709 has 2 divisors, whose sum is σ = 27121710. Its totient is φ = 27121708.

The previous prime is 27121693. The next prime is 27121723. The reversal of 27121709 is 90712172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 6646084 = 4525^2 + 2578^2 .

It is a cyclic number.

It is not a de Polignac number, because 27121709 - 2⁴ = 27121693 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_1690193 and since 27121709 and 1690193 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27121009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13560854 + 13560855.

It is an arithmetic number, because the mean of its divisors is an integer number (13560855).

Almost surely, 2^27121709 is an apocalyptic number.

It is an amenable number.

27121709 is a deficient number, since it is larger than the sum of its proper divisors (1).

27121709 is an equidigital number, since it uses as much as digits as its factorization.

27121709 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 29.

The square root of 27121709 is about 5207.8507083057. The cubic root of 27121709 is about 300.4500984410.

The spelling of 27121709 in words is "twenty-seven million, one hundred twenty-one thousand, seven hundred nine".