57197309 has 8 divisors (see below), whose sum is σ = 63721560. Its totient is φ = 50976576.

The previous prime is 57197293. The next prime is 57197339. The reversal of 57197309 is 90379175.

It can be written as a sum of positive squares in 4 ways, for example, as 240100 + 56957209 = 490^2 + 7547^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57197309 - 2⁴ = 57197293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57197339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75482 + ... + 76235.

It is an arithmetic number, because the mean of its divisors is an integer number (7965195).

Almost surely, 2^57197309 is an apocalyptic number.

It is an amenable number.

57197309 is a deficient number, since it is larger than the sum of its proper divisors (6524251).

57197309 is a wasteful number, since it uses less digits than its factorization.

57197309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151759.

The product of its (nonzero) digits is 59535, while the sum is 41.

The square root of 57197309 is about 7562.8902543935. The cubic root of 57197309 is about 385.2936624955.

The spelling of 57197309 in words is "fifty-seven million, one hundred ninety-seven thousand, three hundred nine".