55049809 has 2 divisors, whose sum is σ = 55049810. Its totient is φ = 55049808.

The previous prime is 55049803. The next prime is 55049851. The reversal of 55049809 is 90894055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47651409 + 7398400 = 6903^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 55049809 - 2⁵ = 55049777 is a prime.

It is not a weakly prime, because it can be changed into another prime (55049803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27524904 + 27524905.

It is an arithmetic number, because the mean of its divisors is an integer number (27524905).

Almost surely, 2^55049809 is an apocalyptic number.

It is an amenable number.

55049809 is a deficient number, since it is larger than the sum of its proper divisors (1).

55049809 is an equidigital number, since it uses as much as digits as its factorization.

55049809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 55049809 is about 7419.5558492406. Note that the first 3 decimals coincide. The cubic root of 55049809 is about 380.4100122014.

The spelling of 55049809 in words is "fifty-five million, forty-nine thousand, eight hundred nine".