55552309 has 2 divisors, whose sum is σ = 55552310. Its totient is φ = 55552308.

The previous prime is 55552307. The next prime is 55552319. The reversal of 55552309 is 90325555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37088100 + 18464209 = 6090^2 + 4297^2 .

It is a cyclic number.

It is not a de Polignac number, because 55552309 - 2¹ = 55552307 is a prime.

Together with 55552307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55552303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27776154 + 27776155.

It is an arithmetic number, because the mean of its divisors is an integer number (27776155).

Almost surely, 2^55552309 is an apocalyptic number.

It is an amenable number.

55552309 is a deficient number, since it is larger than the sum of its proper divisors (1).

55552309 is an equidigital number, since it uses as much as digits as its factorization.

55552309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33750, while the sum is 34.

The square root of 55552309 is about 7453.3421362500. The cubic root of 55552309 is about 381.5639812829.

The spelling of 55552309 in words is "fifty-five million, five hundred fifty-two thousand, three hundred nine".