55090909 has 4 divisors (see below), whose sum is σ = 56263104. Its totient is φ = 53918716.

The previous prime is 55090907. The next prime is 55090927. The reversal of 55090909 is 90909055.

It is a happy number.

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 55090909 - 2¹ = 55090907 is a prime.

It is a Duffinian number.

55090909 is a modest number, since divided by 90909 gives 55 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55090907) 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, 586027 + ... + 586120.

It is an arithmetic number, because the mean of its divisors is an integer number (14065776).

Almost surely, 2^55090909 is an apocalyptic number.

It is an amenable number.

55090909 is a deficient number, since it is larger than the sum of its proper divisors (1172195).

55090909 is a wasteful number, since it uses less digits than its factorization.

55090909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172194.

The product of its (nonzero) digits is 18225, while the sum is 37.

The square root of 55090909 is about 7422.3250400397. The cubic root of 55090909 is about 380.5046595909.

The spelling of 55090909 in words is "fifty-five million, ninety thousand, nine hundred nine".