55393209 has 12 divisors (see below), whose sum is σ = 80644096. Its totient is φ = 36637272.

The previous prime is 55393207. The next prime is 55393229. The reversal of 55393209 is 90239355.

It is not a de Polignac number, because 55393209 - 2¹ = 55393207 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55393201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23089 + ... + 25374.

Almost surely, 2^55393209 is an apocalyptic number.

It is an amenable number.

55393209 is a deficient number, since it is larger than the sum of its proper divisors (25250887).

55393209 is a wasteful number, since it uses less digits than its factorization.

55393209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48596 (or 48593 counting only the distinct ones).

The product of its (nonzero) digits is 36450, while the sum is 36.

The square root of 55393209 is about 7442.6614191430. The cubic root of 55393209 is about 381.1993707202.

The spelling of 55393209 in words is "fifty-five million, three hundred ninety-three thousand, two hundred nine".