55809211 has 4 divisors (see below), whose sum is σ = 56351152. Its totient is φ = 55267272.

The previous prime is 55809203. The next prime is 55809233. The reversal of 55809211 is 11290855.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55809211 - 2³ = 55809203 is a prime.

It is a super-2 number, since 2×55809211² = 6229336064885042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55809511) 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, 270816 + ... + 271021.

It is an arithmetic number, because the mean of its divisors is an integer number (14087788).

Almost surely, 2^55809211 is an apocalyptic number.

55809211 is a deficient number, since it is larger than the sum of its proper divisors (541941).

55809211 is a wasteful number, since it uses less digits than its factorization.

55809211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541940.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 55809211 is about 7470.5562711220. The cubic root of 55809211 is about 382.1512585936.

The spelling of 55809211 in words is "fifty-five million, eight hundred nine thousand, two hundred eleven".