55709009 has 2 divisors, whose sum is σ = 55709010. Its totient is φ = 55709008.

The previous prime is 55708993. The next prime is 55709011. The reversal of 55709009 is 90090755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30558784 + 25150225 = 5528^2 + 5015^2 .

It is a cyclic number.

It is not a de Polignac number, because 55709009 - 2⁴ = 55708993 is a prime.

Together with 55709011, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55709009.

It is not a weakly prime, because it can be changed into another prime (55709099) 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 as a sum of consecutive naturals, namely, 27854504 + 27854505.

It is an arithmetic number, because the mean of its divisors is an integer number (27854505).

Almost surely, 2^55709009 is an apocalyptic number.

It is an amenable number.

55709009 is a deficient number, since it is larger than the sum of its proper divisors (1).

55709009 is an equidigital number, since it uses as much as digits as its factorization.

55709009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14175, while the sum is 35.

The square root of 55709009 is about 7463.8467963913. The cubic root of 55709009 is about 381.9224118985.

The spelling of 55709009 in words is "fifty-five million, seven hundred nine thousand, nine".