57817131821 has 4 divisors (see below), whose sum is σ = 57969684000. Its totient is φ = 57664579644.

The previous prime is 57817131809. The next prime is 57817131881. The reversal of 57817131821 is 12813171875.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57817131821 - 2¹⁰ = 57817130797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57817131881) 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, 76275521 + ... + 76276278.

It is an arithmetic number, because the mean of its divisors is an integer number (14492421000).

Almost surely, 2^57817131821 is an apocalyptic number.

It is an amenable number.

57817131821 is a deficient number, since it is larger than the sum of its proper divisors (152552179).

57817131821 is a wasteful number, since it uses less digits than its factorization.

57817131821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152552178.

The product of its digits is 94080, while the sum is 44.

The spelling of 57817131821 in words is "fifty-seven billion, eight hundred seventeen million, one hundred thirty-one thousand, eight hundred twenty-one".