54721517 has 2 divisors, whose sum is σ = 54721518. Its totient is φ = 54721516.

The previous prime is 54721441. The next prime is 54721543. The reversal of 54721517 is 71512745.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52722121 + 1999396 = 7261^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 54721517 - 2¹⁸ = 54459373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54721547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27360758 + 27360759.

It is an arithmetic number, because the mean of its divisors is an integer number (27360759).

Almost surely, 2^54721517 is an apocalyptic number.

It is an amenable number.

54721517 is a deficient number, since it is larger than the sum of its proper divisors (1).

54721517 is an equidigital number, since it uses as much as digits as its factorization.

54721517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9800, while the sum is 32.

The square root of 54721517 is about 7397.3993403087. The cubic root of 54721517 is about 379.6523066174.

The spelling of 54721517 in words is "fifty-four million, seven hundred twenty-one thousand, five hundred seventeen".