55091309 has 32 divisors (see below), whose sum is σ = 71393280. Its totient is φ = 41342400.

The previous prime is 55091297. The next prime is 55091321. The reversal of 55091309 is 90319055.

It is an interprime number because it is at equal distance from previous prime (55091297) and next prime (55091321).

It is a cyclic number.

It is not a de Polignac number, because 55091309 - 2²⁰ = 54042733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55091369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166274 + ... + 166604.

It is an arithmetic number, because the mean of its divisors is an integer number (2231040).

Almost surely, 2^55091309 is an apocalyptic number.

55091309 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

55091309 is a deficient number, since it is larger than the sum of its proper divisors (16301971).

55091309 is a wasteful number, since it uses less digits than its factorization.

55091309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 55091309 is about 7422.3519857253. The cubic root of 55091309 is about 380.5055805021.

The spelling of 55091309 in words is "fifty-five million, ninety-one thousand, three hundred nine".