57171749 has 2 divisors, whose sum is σ = 57171750. Its totient is φ = 57171748.

The previous prime is 57171743. The next prime is 57171769. The reversal of 57171749 is 94717175.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28890625 + 28281124 = 5375^2 + 5318^2 .

It is a cyclic number.

It is not a de Polignac number, because 57171749 - 2²⁰ = 56123173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57171743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28585874 + 28585875.

It is an arithmetic number, because the mean of its divisors is an integer number (28585875).

Almost surely, 2^57171749 is an apocalyptic number.

It is an amenable number.

57171749 is a deficient number, since it is larger than the sum of its proper divisors (1).

57171749 is an equidigital number, since it uses as much as digits as its factorization.

57171749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61740, while the sum is 41.

The square root of 57171749 is about 7561.2002354124. The cubic root of 57171749 is about 385.2362613490.

The spelling of 57171749 in words is "fifty-seven million, one hundred seventy-one thousand, seven hundred forty-nine".