55921117 has 16 divisors (see below), whose sum is σ = 67387392. Its totient is φ = 45390960.

The previous prime is 55921093. The next prime is 55921133. The reversal of 55921117 is 71112955.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55921117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55921147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7458 + ... + 12940.

It is an arithmetic number, because the mean of its divisors is an integer number (4211712).

Almost surely, 2^55921117 is an apocalyptic number.

It is an amenable number.

55921117 is a deficient number, since it is larger than the sum of its proper divisors (11466275).

55921117 is a wasteful number, since it uses less digits than its factorization.

55921117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5568.

The product of its digits is 3150, while the sum is 31.

The square root of 55921117 is about 7478.0423240311. The cubic root of 55921117 is about 382.4065119607.

The spelling of 55921117 in words is "fifty-five million, nine hundred twenty-one thousand, one hundred seventeen".