55539889 has 2 divisors, whose sum is σ = 55539890. Its totient is φ = 55539888.

The previous prime is 55539881. The next prime is 55539929. The reversal of 55539889 is 98893555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52417600 + 3122289 = 7240^2 + 1767^2 .

It is a cyclic number.

It is not a de Polignac number, because 55539889 - 2³ = 55539881 is a prime.

It is not a weakly prime, because it can be changed into another prime (55539881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27769944 + 27769945.

It is an arithmetic number, because the mean of its divisors is an integer number (27769945).

Almost surely, 2^55539889 is an apocalyptic number.

It is an amenable number.

55539889 is a deficient number, since it is larger than the sum of its proper divisors (1).

55539889 is an equidigital number, since it uses as much as digits as its factorization.

55539889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944000, while the sum is 52.

The square root of 55539889 is about 7452.5089064019. The cubic root of 55539889 is about 381.5355433538.

The spelling of 55539889 in words is "fifty-five million, five hundred thirty-nine thousand, eight hundred eighty-nine".