57071309 has 4 divisors (see below), whose sum is σ = 57283740. Its totient is φ = 56858880.

The previous prime is 57071293. The next prime is 57071359. The reversal of 57071309 is 90317075.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27857284 + 29214025 = 5278^2 + 5405^2 .

It is a cyclic number.

It is not a de Polignac number, because 57071309 - 2⁴ = 57071293 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 (57071359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105812 + ... + 106349.

It is an arithmetic number, because the mean of its divisors is an integer number (14320935).

Almost surely, 2^57071309 is an apocalyptic number.

It is an amenable number.

57071309 is a deficient number, since it is larger than the sum of its proper divisors (212431).

57071309 is a wasteful number, since it uses less digits than its factorization.

57071309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212430.

The product of its (nonzero) digits is 6615, while the sum is 32.

The square root of 57071309 is about 7554.5555130663. Note that the first 4 decimals coincide. The cubic root of 57071309 is about 385.0105332475.

The spelling of 57071309 in words is "fifty-seven million, seventy-one thousand, three hundred nine".