57397509 has 12 divisors (see below), whose sum is σ = 89285196. Its totient is φ = 35321472.

The previous prime is 57397507. The next prime is 57397511. The reversal of 57397509 is 90579375.

It is a happy number.

57397509 is a `hidden beast` number, since 57 + 3 + 97 + 509 = 666.

57397509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (57397507) and next prime (57397511).

It can be written as a sum of positive squares in 2 ways, for example, as 14861025 + 42536484 = 3855^2 + 6522^2 .

It is not a de Polignac number, because 57397509 - 2¹ = 57397507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57397507) 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 in 11 ways as a sum of consecutive naturals, for example, 245172 + ... + 245405.

It is an arithmetic number, because the mean of its divisors is an integer number (7440433).

Almost surely, 2^57397509 is an apocalyptic number.

It is an amenable number.

57397509 is a deficient number, since it is larger than the sum of its proper divisors (31887687).

57397509 is a wasteful number, since it uses less digits than its factorization.

57397509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490596 (or 490593 counting only the distinct ones).

The product of its (nonzero) digits is 297675, while the sum is 45.

The square root of 57397509 is about 7576.1143734767. The cubic root of 57397509 is about 385.7426694574.

The spelling of 57397509 in words is "fifty-seven million, three hundred ninety-seven thousand, five hundred nine".