55206817 has 2 divisors, whose sum is σ = 55206818. Its totient is φ = 55206816.

The previous prime is 55206743. The next prime is 55206829. The reversal of 55206817 is 71860255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33593616 + 21613201 = 5796^2 + 4649^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55206817 is a prime.

It is not a weakly prime, because it can be changed into another prime (55206847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27603408 + 27603409.

It is an arithmetic number, because the mean of its divisors is an integer number (27603409).

Almost surely, 2^55206817 is an apocalyptic number.

It is an amenable number.

55206817 is a deficient number, since it is larger than the sum of its proper divisors (1).

55206817 is an equidigital number, since it uses as much as digits as its factorization.

55206817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 55206817 is about 7430.1290029178. The cubic root of 55206817 is about 380.7713257287.

The spelling of 55206817 in words is "fifty-five million, two hundred six thousand, eight hundred seventeen".