55277809 has 4 divisors (see below), whose sum is σ = 57681216. Its totient is φ = 52874404.

The previous prime is 55277791. The next prime is 55277839. The reversal of 55277809 is 90877255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55277809 - 2⁵ = 55277777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55277839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1201669 + ... + 1201714.

It is an arithmetic number, because the mean of its divisors is an integer number (14420304).

Almost surely, 2^55277809 is an apocalyptic number.

It is an amenable number.

55277809 is a deficient number, since it is larger than the sum of its proper divisors (2403407).

55277809 is a wasteful number, since it uses less digits than its factorization.

55277809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403406.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 55277809 is about 7434.9047741044. The cubic root of 55277809 is about 380.9344706731.

The spelling of 55277809 in words is "fifty-five million, two hundred seventy-seven thousand, eight hundred nine".