57216829 has 2 divisors, whose sum is σ = 57216830. Its totient is φ = 57216828.

The previous prime is 57216823. The next prime is 57216851. The reversal of 57216829 is 92861275.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51811204 + 5405625 = 7198^2 + 2325^2 .

It is a cyclic number.

It is not a de Polignac number, because 57216829 - 2⁹ = 57216317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 57216791 and 57216800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57216823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28608414 + 28608415.

It is an arithmetic number, because the mean of its divisors is an integer number (28608415).

Almost surely, 2^57216829 is an apocalyptic number.

It is an amenable number.

57216829 is a deficient number, since it is larger than the sum of its proper divisors (1).

57216829 is an equidigital number, since it uses as much as digits as its factorization.

57216829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 57216829 is about 7564.1806562244. The cubic root of 57216829 is about 385.3374878491.

The spelling of 57216829 in words is "fifty-seven million, two hundred sixteen thousand, eight hundred twenty-nine".