55945821 has 8 divisors (see below), whose sum is σ = 77837760. Its totient is φ = 35675552.

The previous prime is 55945807. The next prime is 55945831. The reversal of 55945821 is 12854955.

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 55945821 - 2¹⁴ = 55929437 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55945821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55945831) 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, 405336 + ... + 405473.

It is an arithmetic number, because the mean of its divisors is an integer number (9729720).

Almost surely, 2^55945821 is an apocalyptic number.

It is an amenable number.

55945821 is a deficient number, since it is larger than the sum of its proper divisors (21891939).

55945821 is a wasteful number, since it uses less digits than its factorization.

55945821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810835.

The product of its digits is 72000, while the sum is 39.

The square root of 55945821 is about 7479.6939108496. The cubic root of 55945821 is about 382.4628149592.

The spelling of 55945821 in words is "fifty-five million, nine hundred forty-five thousand, eight hundred twenty-one".