57130813 has 4 divisors (see below), whose sum is σ = 57176028. Its totient is φ = 57085600.

The previous prime is 57130811. The next prime is 57130817. The reversal of 57130813 is 31803175.

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 15824484 + 41306329 = 3978^2 + 6427^2 .

It is a cyclic number.

It is not a de Polignac number, because 57130813 - 2¹ = 57130811 is a prime.

It is a super-3 number, since 3×57130813³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57130811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20656 + ... + 23257.

It is an arithmetic number, because the mean of its divisors is an integer number (14294007).

Almost surely, 2^57130813 is an apocalyptic number.

It is an amenable number.

57130813 is a deficient number, since it is larger than the sum of its proper divisors (45215).

57130813 is a wasteful number, since it uses less digits than its factorization.

57130813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45214.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 57130813 is about 7558.4927730335. The cubic root of 57130813 is about 385.1442940327.

Adding to 57130813 its reverse (31803175), we get a palindrome (88933988).

The spelling of 57130813 in words is "fifty-seven million, one hundred thirty thousand, eight hundred thirteen".