55042009 has 4 divisors (see below), whose sum is σ = 60045840. Its totient is φ = 50038180.

The previous prime is 55041991. The next prime is 55042027. The reversal of 55042009 is 90024055.

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 an interprime number because it is at equal distance from previous prime (55041991) and next prime (55042027).

It is a cyclic number.

It is not a de Polignac number, because 55042009 - 2¹⁷ = 54910937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55042909) 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, 2501899 + ... + 2501920.

It is an arithmetic number, because the mean of its divisors is an integer number (15011460).

Almost surely, 2^55042009 is an apocalyptic number.

It is an amenable number.

55042009 is a deficient number, since it is larger than the sum of its proper divisors (5003831).

55042009 is a wasteful number, since it uses less digits than its factorization.

55042009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5003830.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 55042009 is about 7419.0301926869. The cubic root of 55042009 is about 380.3920446051.

The spelling of 55042009 in words is "fifty-five million, forty-two thousand, nine".