55111709 has 2 divisors, whose sum is σ = 55111710. Its totient is φ = 55111708.

The previous prime is 55111699. The next prime is 55111711. The reversal of 55111709 is 90711155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33674809 + 21436900 = 5803^2 + 4630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55111709 is a prime.

Together with 55111711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55111789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27555854 + 27555855.

It is an arithmetic number, because the mean of its divisors is an integer number (27555855).

Almost surely, 2^55111709 is an apocalyptic number.

It is an amenable number.

55111709 is a deficient number, since it is larger than the sum of its proper divisors (1).

55111709 is an equidigital number, since it uses as much as digits as its factorization.

55111709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1575, while the sum is 29.

The square root of 55111709 is about 7423.7260860029. The cubic root of 55111709 is about 380.5525410606.

The spelling of 55111709 in words is "fifty-five million, one hundred eleven thousand, seven hundred nine".