57540421 has 2 divisors, whose sum is σ = 57540422. Its totient is φ = 57540420.

The previous prime is 57540403. The next prime is 57540451. The reversal of 57540421 is 12404575.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32148900 + 25391521 = 5670^2 + 5039^2 .

It is a cyclic number.

It is not a de Polignac number, because 57540421 - 2⁵ = 57540389 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57540421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57540451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28770210 + 28770211.

It is an arithmetic number, because the mean of its divisors is an integer number (28770211).

Almost surely, 2^57540421 is an apocalyptic number.

It is an amenable number.

57540421 is a deficient number, since it is larger than the sum of its proper divisors (1).

57540421 is an equidigital number, since it uses as much as digits as its factorization.

57540421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 57540421 is about 7585.5402576217. The cubic root of 57540421 is about 386.0625530632.

Adding to 57540421 its reverse (12404575), we get a palindrome (69944996).

The spelling of 57540421 in words is "fifty-seven million, five hundred forty thousand, four hundred twenty-one".