55550309 has 2 divisors, whose sum is σ = 55550310. Its totient is φ = 55550308.

The previous prime is 55550291. The next prime is 55550317. The reversal of 55550309 is 90305555.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50098084 + 5452225 = 7078^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 55550309 - 2¹⁶ = 55484773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55552309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27775154 + 27775155.

It is an arithmetic number, because the mean of its divisors is an integer number (27775155).

Almost surely, 2^55550309 is an apocalyptic number.

It is an amenable number.

55550309 is a deficient number, since it is larger than the sum of its proper divisors (1).

55550309 is an equidigital number, since it uses as much as digits as its factorization.

55550309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16875, while the sum is 32.

The square root of 55550309 is about 7453.2079670435. The cubic root of 55550309 is about 381.5594021926.

The spelling of 55550309 in words is "fifty-five million, five hundred fifty thousand, three hundred nine".