55071209 has 2 divisors, whose sum is σ = 55071210. Its totient is φ = 55071208.

The previous prime is 55071193. The next prime is 55071229. The reversal of 55071209 is 90217055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45859984 + 9211225 = 6772^2 + 3035^2 .

It is a cyclic number.

It is not a de Polignac number, because 55071209 - 2⁴ = 55071193 is a prime.

It is not a weakly prime, because it can be changed into another prime (55071229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27535604 + 27535605.

It is an arithmetic number, because the mean of its divisors is an integer number (27535605).

Almost surely, 2^55071209 is an apocalyptic number.

It is an amenable number.

55071209 is a deficient number, since it is larger than the sum of its proper divisors (1).

55071209 is an equidigital number, since it uses as much as digits as its factorization.

55071209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 55071209 is about 7420.9978439560. The cubic root of 55071209 is about 380.4592992002.

The spelling of 55071209 in words is "fifty-five million, seventy-one thousand, two hundred nine".