55221717 has 8 divisors (see below), whose sum is σ = 73862496. Its totient is φ = 36697712.

The previous prime is 55221709. The next prime is 55221721. The reversal of 55221717 is 71712255.

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 55221717 - 2³ = 55221709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55221217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28083 + ... + 29984.

It is an arithmetic number, because the mean of its divisors is an integer number (9232812).

Almost surely, 2^55221717 is an apocalyptic number.

It is an amenable number.

55221717 is a deficient number, since it is larger than the sum of its proper divisors (18640779).

55221717 is a wasteful number, since it uses less digits than its factorization.

55221717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58387.

The product of its digits is 4900, while the sum is 30.

The square root of 55221717 is about 7431.1316096541. The cubic root of 55221717 is about 380.8055786387.

The spelling of 55221717 in words is "fifty-five million, two hundred twenty-one thousand, seven hundred seventeen".