55330309 has 2 divisors, whose sum is σ = 55330310. Its totient is φ = 55330308.

The previous prime is 55330271. The next prime is 55330333. The reversal of 55330309 is 90303355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39727809 + 15602500 = 6303^2 + 3950^2 .

It is a cyclic number.

It is not a de Polignac number, because 55330309 - 2⁷ = 55330181 is a prime.

It is a super-2 number, since 2×55330309² = 6122886188070962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55330349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27665154 + 27665155.

It is an arithmetic number, because the mean of its divisors is an integer number (27665155).

Almost surely, 2^55330309 is an apocalyptic number.

It is an amenable number.

55330309 is a deficient number, since it is larger than the sum of its proper divisors (1).

55330309 is an equidigital number, since it uses as much as digits as its factorization.

55330309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6075, while the sum is 28.

The square root of 55330309 is about 7438.4345799368. The cubic root of 55330309 is about 381.0550297911.

The spelling of 55330309 in words is "fifty-five million, three hundred thirty thousand, three hundred nine".