55253309 has 2 divisors, whose sum is σ = 55253310. Its totient is φ = 55253308.

The previous prime is 55253293. The next prime is 55253339. The reversal of 55253309 is 90335255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54804409 + 448900 = 7403^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 55253309 - 2⁴ = 55253293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55253339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27626654 + 27626655.

It is an arithmetic number, because the mean of its divisors is an integer number (27626655).

Almost surely, 2^55253309 is an apocalyptic number.

It is an amenable number.

55253309 is a deficient number, since it is larger than the sum of its proper divisors (1).

55253309 is an equidigital number, since it uses as much as digits as its factorization.

55253309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20250, while the sum is 32.

The square root of 55253309 is about 7433.2569577541. The cubic root of 55253309 is about 380.8781836273.

The spelling of 55253309 in words is "fifty-five million, two hundred fifty-three thousand, three hundred nine".