55043509 has 4 divisors (see below), whose sum is σ = 55578016. Its totient is φ = 54509004.

The previous prime is 55043497. The next prime is 55043539. The reversal of 55043509 is 90534055.

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 55043509 - 2⁵ = 55043477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55043539) 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, 267099 + ... + 267304.

It is an arithmetic number, because the mean of its divisors is an integer number (13894504).

Almost surely, 2^55043509 is an apocalyptic number.

It is an amenable number.

55043509 is a deficient number, since it is larger than the sum of its proper divisors (534507).

55043509 is a wasteful number, since it uses less digits than its factorization.

55043509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534506.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 55043509 is about 7419.1312833781. The cubic root of 55043509 is about 380.3955000439.

The spelling of 55043509 in words is "fifty-five million, forty-three thousand, five hundred nine".