55415921 has 8 divisors (see below), whose sum is σ = 60722784. Its totient is φ = 50153920.

The previous prime is 55415911. The next prime is 55415923. The reversal of 55415921 is 12951455.

55415921 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 a cyclic number.

It is not a de Polignac number, because 55415921 - 2¹⁰ = 55414897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55415923) 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, 8600 + ... + 13593.

It is an arithmetic number, because the mean of its divisors is an integer number (7590348).

Almost surely, 2^55415921 is an apocalyptic number.

It is an amenable number.

55415921 is a deficient number, since it is larger than the sum of its proper divisors (5306863).

55415921 is a wasteful number, since it uses less digits than its factorization.

55415921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22431.

The product of its digits is 9000, while the sum is 32.

The square root of 55415921 is about 7444.1870610564. The cubic root of 55415921 is about 381.2514626478.

The spelling of 55415921 in words is "fifty-five million, four hundred fifteen thousand, nine hundred twenty-one".