54109721 has 2 divisors, whose sum is σ = 54109722. Its totient is φ = 54109720.

The previous prime is 54109703. The next prime is 54109751. The reversal of 54109721 is 12790145.

54109721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36132121 + 17977600 = 6011^2 + 4240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54109721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (54109751) 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 as a sum of consecutive naturals, namely, 27054860 + 27054861.

It is an arithmetic number, because the mean of its divisors is an integer number (27054861).

Almost surely, 2^54109721 is an apocalyptic number.

It is an amenable number.

54109721 is a deficient number, since it is larger than the sum of its proper divisors (1).

54109721 is an equidigital number, since it uses as much as digits as its factorization.

54109721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 54109721 is about 7355.9310083768. The cubic root of 54109721 is about 378.2321414029.

Adding to 54109721 its reverse (12790145), we get a palindrome (66899866).

The spelling of 54109721 in words is "fifty-four million, one hundred nine thousand, seven hundred twenty-one".