57717221 has 4 divisors (see below), whose sum is σ = 59707500. Its totient is φ = 55726944.

The previous prime is 57717203. The next prime is 57717239. The reversal of 57717221 is 12271775.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (57717203) and next prime (57717239).

It can be written as a sum of positive squares in 2 ways, for example, as 39866596 + 17850625 = 6314^2 + 4225^2 .

It is a cyclic number.

It is not a de Polignac number, because 57717221 - 2¹⁴ = 57700837 is a prime.

It is a super-4 number, since 4×57717221⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57717241) 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, 995096 + ... + 995153.

It is an arithmetic number, because the mean of its divisors is an integer number (14926875).

Almost surely, 2^57717221 is an apocalyptic number.

It is an amenable number.

57717221 is a deficient number, since it is larger than the sum of its proper divisors (1990279).

57717221 is a wasteful number, since it uses less digits than its factorization.

57717221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990278.

The product of its digits is 6860, while the sum is 32.

The square root of 57717221 is about 7597.1850708009. The cubic root of 57717221 is about 386.4575569528.

Adding to 57717221 its reverse (12271775), we get a palindrome (69988996).

The spelling of 57717221 in words is "fifty-seven million, seven hundred seventeen thousand, two hundred twenty-one".