57243309 has 8 divisors (see below), whose sum is σ = 76408800. Its totient is φ = 38120016.

The previous prime is 57243293. The next prime is 57243313. The reversal of 57243309 is 90334275.

It is a happy number.

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

It is not a de Polignac number, because 57243309 - 2⁴ = 57243293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57243309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57243379) 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, 7234 + ... + 12915.

It is an arithmetic number, because the mean of its divisors is an integer number (9551100).

Almost surely, 2^57243309 is an apocalyptic number.

It is an amenable number.

57243309 is a deficient number, since it is larger than the sum of its proper divisors (19165491).

57243309 is a wasteful number, since it uses less digits than its factorization.

57243309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21099.

The product of its (nonzero) digits is 22680, while the sum is 33.

The square root of 57243309 is about 7565.9308085655. The cubic root of 57243309 is about 385.3969235266.

The spelling of 57243309 in words is "fifty-seven million, two hundred forty-three thousand, three hundred nine".