55721441 has 8 divisors (see below), whose sum is σ = 57731520. Its totient is φ = 53717328.

The previous prime is 55721437. The next prime is 55721443. The reversal of 55721441 is 14412755.

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 55721441 - 2² = 55721437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55721443) 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, 27050 + ... + 29036.

It is an arithmetic number, because the mean of its divisors is an integer number (7216440).

Almost surely, 2^55721441 is an apocalyptic number.

It is an amenable number.

55721441 is a deficient number, since it is larger than the sum of its proper divisors (2010079).

55721441 is a wasteful number, since it uses less digits than its factorization.

55721441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983.

The product of its digits is 5600, while the sum is 29.

The square root of 55721441 is about 7464.6795644555. The cubic root of 55721441 is about 381.9508196693.

The spelling of 55721441 in words is "fifty-five million, seven hundred twenty-one thousand, four hundred forty-one".