57531812521 has 4 divisors (see below), whose sum is σ = 57745685700. Its totient is φ = 57317939344.

The previous prime is 57531812501. The next prime is 57531812543. The reversal of 57531812521 is 12521813575.

It is a happy number.

57531812521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2007488025 + 55524324496 = 44805^2 + 235636^2 .

It is a cyclic number.

It is not a de Polignac number, because 57531812521 - 2²⁹ = 56994941609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57531812501) 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, 106936186 + ... + 106936723.

It is an arithmetic number, because the mean of its divisors is an integer number (14436421425).

Almost surely, 2^57531812521 is an apocalyptic number.

It is an amenable number.

57531812521 is a deficient number, since it is larger than the sum of its proper divisors (213873179).

57531812521 is a wasteful number, since it uses less digits than its factorization.

57531812521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213873178.

The product of its digits is 84000, while the sum is 40.

The spelling of 57531812521 in words is "fifty-seven billion, five hundred thirty-one million, eight hundred twelve thousand, five hundred twenty-one".