55454921 has 6 divisors (see below), whose sum is σ = 56093022. Its totient is φ = 54824000.

The previous prime is 55454911. The next prime is 55454923. The reversal of 55454921 is 12945455.

It is a happy number.

55454921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 26896 + 55428025 = 164^2 + 7445^2 .

It is not a de Polignac number, because 55454921 - 2⁶ = 55454857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55454923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4421 + ... + 11421.

It is an arithmetic number, because the mean of its divisors is an integer number (9348837).

Almost surely, 2^55454921 is an apocalyptic number.

It is an amenable number.

55454921 is a deficient number, since it is larger than the sum of its proper divisors (638101).

55454921 is an frugal number, since it uses more digits than its factorization.

55454921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7179 (or 7090 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The square root of 55454921 is about 7446.8060938902. The cubic root of 55454921 is about 381.3408793116.

The spelling of 55454921 in words is "fifty-five million, four hundred fifty-four thousand, nine hundred twenty-one".