57353821 has 4 divisors (see below), whose sum is σ = 65547232. Its totient is φ = 49160412.

The previous prime is 57353783. The next prime is 57353833. The reversal of 57353821 is 12835375.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-57353821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57353861) 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, 4096695 + ... + 4096708.

It is an arithmetic number, because the mean of its divisors is an integer number (16386808).

Almost surely, 2^57353821 is an apocalyptic number.

It is an amenable number.

57353821 is a deficient number, since it is larger than the sum of its proper divisors (8193411).

57353821 is an equidigital number, since it uses as much as digits as its factorization.

57353821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8193410.

The product of its digits is 25200, while the sum is 34.

The square root of 57353821 is about 7573.2305524129. The cubic root of 57353821 is about 385.6447755270.

The spelling of 57353821 in words is "fifty-seven million, three hundred fifty-three thousand, eight hundred twenty-one".