57505421 has 2 divisors, whose sum is σ = 57505422. Its totient is φ = 57505420.

The previous prime is 57505417. The next prime is 57505433. The reversal of 57505421 is 12450575.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41744521 + 15760900 = 6461^2 + 3970^2 .

It is a cyclic number.

It is not a de Polignac number, because 57505421 - 2² = 57505417 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57505121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28752710 + 28752711.

It is an arithmetic number, because the mean of its divisors is an integer number (28752711).

Almost surely, 2^57505421 is an apocalyptic number.

It is an amenable number.

57505421 is a deficient number, since it is larger than the sum of its proper divisors (1).

57505421 is an equidigital number, since it uses as much as digits as its factorization.

57505421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 57505421 is about 7583.2328857816. The cubic root of 57505421 is about 385.9842606807.

Adding to 57505421 its reverse (12450575), we get a palindrome (69955996).

The spelling of 57505421 in words is "fifty-seven million, five hundred five thousand, four hundred twenty-one".