55055521 has 8 divisors (see below), whose sum is σ = 58468320. Its totient is φ = 51694272.

The previous prime is 55055479. The next prime is 55055569. The reversal of 55055521 is 12555055.

It is a happy number.

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 55055521 - 2⁹ = 55055009 is a prime.

It is a super-2 number, since 2×55055521² = 6062220785162882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55055521.

It is not an unprimeable number, because it can be changed into a prime (55055591) 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, 10675 + ... + 14968.

It is an arithmetic number, because the mean of its divisors is an integer number (7308540).

Almost surely, 2^55055521 is an apocalyptic number.

It is an amenable number.

55055521 is a deficient number, since it is larger than the sum of its proper divisors (3412799).

55055521 is a wasteful number, since it uses less digits than its factorization.

55055521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25775.

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 55055521 is about 7419.9407679577. The cubic root of 55055521 is about 380.4231689340.

It can be divided in two parts, 5505 and 5521, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 55055521 in words is "fifty-five million, fifty-five thousand, five hundred twenty-one".