57705121 has 2 divisors, whose sum is σ = 57705122. Its totient is φ = 57705120.

The previous prime is 57705101. The next prime is 57705149. The reversal of 57705121 is 12150775.

It is an a-pointer prime, because the next prime (57705149) can be obtained adding 57705121 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43560000 + 14145121 = 6600^2 + 3761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57705121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57705121.

It is not a weakly prime, because it can be changed into another prime (57705101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28852560 + 28852561.

It is an arithmetic number, because the mean of its divisors is an integer number (28852561).

Almost surely, 2^57705121 is an apocalyptic number.

It is an amenable number.

57705121 is a deficient number, since it is larger than the sum of its proper divisors (1).

57705121 is an equidigital number, since it uses as much as digits as its factorization.

57705121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 57705121 is about 7596.3886814723. The cubic root of 57705121 is about 386.4305490502.

Adding to 57705121 its reverse (12150775), we get a palindrome (69855896).

The spelling of 57705121 in words is "fifty-seven million, seven hundred five thousand, one hundred twenty-one".