57553021 has 2 divisors, whose sum is σ = 57553022. Its totient is φ = 57553020.

The previous prime is 57553009. The next prime is 57553063. The reversal of 57553021 is 12035575.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57547396 + 5625 = 7586^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 57553021 - 2⁷ = 57552893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57553091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28776510 + 28776511.

It is an arithmetic number, because the mean of its divisors is an integer number (28776511).

Almost surely, 2^57553021 is an apocalyptic number.

It is an amenable number.

57553021 is a deficient number, since it is larger than the sum of its proper divisors (1).

57553021 is an equidigital number, since it uses as much as digits as its factorization.

57553021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 57553021 is about 7586.3707396884. The cubic root of 57553021 is about 386.0907305488.

Adding to 57553021 its reverse (12035575), we get a palindrome (69588596).

The spelling of 57553021 in words is "fifty-seven million, five hundred fifty-three thousand, twenty-one".