55851909 has 8 divisors (see below), whose sum is σ = 74508672. Its totient is φ = 37214880.

The previous prime is 55851899. The next prime is 55851931. The reversal of 55851909 is 90915855.

It is a happy number.

55851909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55851909 - 2⁴ = 55851893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55851949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3969 + ... + 11289.

It is an arithmetic number, because the mean of its divisors is an integer number (9313584).

Almost surely, 2^55851909 is an apocalyptic number.

It is an amenable number.

55851909 is a deficient number, since it is larger than the sum of its proper divisors (18656763).

55851909 is a wasteful number, since it uses less digits than its factorization.

55851909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9867.

The product of its (nonzero) digits is 81000, while the sum is 42.

The square root of 55851909 is about 7473.4134771201. The cubic root of 55851909 is about 382.2486913451.

The spelling of 55851909 in words is "fifty-five million, eight hundred fifty-one thousand, nine hundred nine".