54157721 has 2 divisors, whose sum is σ = 54157722. Its totient is φ = 54157720.

The previous prime is 54157711. The next prime is 54157759. The reversal of 54157721 is 12775145.

54157721 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., 50694400 + 3463321 = 7120^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 54157721 - 2¹⁴ = 54141337 is a prime.

It is a super-3 number, since 3×54157721³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (54157711) 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, 27078860 + 27078861.

It is an arithmetic number, because the mean of its divisors is an integer number (27078861).

Almost surely, 2^54157721 is an apocalyptic number.

It is an amenable number.

54157721 is a deficient number, since it is larger than the sum of its proper divisors (1).

54157721 is an equidigital number, since it uses as much as digits as its factorization.

54157721 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 54157721 is about 7359.1929584704. The cubic root of 54157721 is about 378.3439498833.

The spelling of 54157721 in words is "fifty-four million, one hundred fifty-seven thousand, seven hundred twenty-one".