57521887 has 2 divisors, whose sum is σ = 57521888. Its totient is φ = 57521886.

The previous prime is 57521861. The next prime is 57521899. The reversal of 57521887 is 78812575.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57521887 is a prime.

It is a super-3 number, since 3×57521887³ (a number of 24 digits) contains 333 as substring.

It is a plaindrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57521837) 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 as a sum of consecutive naturals, namely, 28760943 + 28760944.

It is an arithmetic number, because the mean of its divisors is an integer number (28760944).

Almost surely, 2^57521887 is an apocalyptic number.

57521887 is a deficient number, since it is larger than the sum of its proper divisors (1).

57521887 is an equidigital number, since it uses as much as digits as its factorization.

57521887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156800, while the sum is 43.

The square root of 57521887 is about 7584.3184927850. The cubic root of 57521887 is about 386.0210978472.

The spelling of 57521887 in words is "fifty-seven million, five hundred twenty-one thousand, eight hundred eighty-seven".