55755921 has 16 divisors (see below), whose sum is σ = 80697344. Its totient is φ = 34038144.

The previous prime is 55755901. The next prime is 55755923. The reversal of 55755921 is 12955755.

It is not a de Polignac number, because 55755921 - 2⁹ = 55755409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 55755921.

It is not an unprimeable number, because it can be changed into a prime (55755923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 676 + ... + 10581.

It is an arithmetic number, because the mean of its divisors is an integer number (5043584).

Almost surely, 2^55755921 is an apocalyptic number.

It is an amenable number.

55755921 is a deficient number, since it is larger than the sum of its proper divisors (24941423).

55755921 is a wasteful number, since it uses less digits than its factorization.

55755921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11400.

The product of its digits is 78750, while the sum is 39.

The square root of 55755921 is about 7466.9887504937. The cubic root of 55755921 is about 382.0295861700.

The spelling of 55755921 in words is "fifty-five million, seven hundred fifty-five thousand, nine hundred twenty-one".