55542521 has 8 divisors (see below), whose sum is σ = 56415744. Its totient is φ = 54674320.

The previous prime is 55542517. The next prime is 55542533. The reversal of 55542521 is 12524555.

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 55542521 - 2² = 55542517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55542121) 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, 25256 + ... + 27366.

It is an arithmetic number, because the mean of its divisors is an integer number (7051968).

Almost surely, 2^55542521 is an apocalyptic number.

It is an amenable number.

55542521 is a deficient number, since it is larger than the sum of its proper divisors (873223).

55542521 is a wasteful number, since it uses less digits than its factorization.

55542521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511.

The product of its digits is 10000, while the sum is 29.

The square root of 55542521 is about 7452.6854891375. The cubic root of 55542521 is about 381.5415701675.

The spelling of 55542521 in words is "fifty-five million, five hundred forty-two thousand, five hundred twenty-one".