57249209 has 2 divisors, whose sum is σ = 57249210. Its totient is φ = 57249208.

The previous prime is 57249197. The next prime is 57249221. The reversal of 57249209 is 90294275.

It is a balanced prime because it is at equal distance from previous prime (57249197) and next prime (57249221).

It can be written as a sum of positive squares in only one way, i.e., 55875625 + 1373584 = 7475^2 + 1172^2 .

It is a cyclic number.

It is not a de Polignac number, because 57249209 - 2¹² = 57245113 is a prime.

It is a super-2 number, since 2×57249209² = 6554943862251362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57249239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28624604 + 28624605.

It is an arithmetic number, because the mean of its divisors is an integer number (28624605).

Almost surely, 2^57249209 is an apocalyptic number.

It is an amenable number.

57249209 is a deficient number, since it is larger than the sum of its proper divisors (1).

57249209 is an equidigital number, since it uses as much as digits as its factorization.

57249209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 57249209 is about 7566.3207042789. The cubic root of 57249209 is about 385.4101638731.

The spelling of 57249209 in words is "fifty-seven million, two hundred forty-nine thousand, two hundred nine".