54721243 has 2 divisors, whose sum is σ = 54721244. Its totient is φ = 54721242.

The previous prime is 54721213. The next prime is 54721253. The reversal of 54721243 is 34212745.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54721243 is a prime.

It is not a weakly prime, because it can be changed into another prime (54721213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27360621 + 27360622.

It is an arithmetic number, because the mean of its divisors is an integer number (27360622).

Almost surely, 2^54721243 is an apocalyptic number.

54721243 is a deficient number, since it is larger than the sum of its proper divisors (1).

54721243 is an equidigital number, since it uses as much as digits as its factorization.

54721243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 28.

The square root of 54721243 is about 7397.3808202633. The cubic root of 54721243 is about 379.6516729550.

Adding to 54721243 its reverse (34212745), we get a palindrome (88933988).

The spelling of 54721243 in words is "fifty-four million, seven hundred twenty-one thousand, two hundred forty-three".