55577009 has 4 divisors (see below), whose sum is σ = 55591920. Its totient is φ = 55562100.

The previous prime is 55576999. The next prime is 55577047. The reversal of 55577009 is 90077555.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90077555 = 5 ⋅18015511.

It is a cyclic number.

It is not a de Polignac number, because 55577009 - 2²⁰ = 54528433 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 (55577089) 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, 3722 + ... + 11180.

It is an arithmetic number, because the mean of its divisors is an integer number (13897980).

Almost surely, 2^55577009 is an apocalyptic number.

It is an amenable number.

55577009 is a deficient number, since it is larger than the sum of its proper divisors (14911).

55577009 is an equidigital number, since it uses as much as digits as its factorization.

55577009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14910.

The product of its (nonzero) digits is 55125, while the sum is 38.

The square root of 55577009 is about 7454.9989268946. The cubic root of 55577009 is about 381.6205239904.

The spelling of 55577009 in words is "fifty-five million, five hundred seventy-seven thousand, nine".