57221497 has 4 divisors (see below), whose sum is σ = 57364596. Its totient is φ = 57078400.

The previous prime is 57221441. The next prime is 57221533. The reversal of 57221497 is 79412275.

57221497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 51538041 + 5683456 = 7179^2 + 2384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57221497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57221797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70948 + ... + 71749.

It is an arithmetic number, because the mean of its divisors is an integer number (14341149).

Almost surely, 2^57221497 is an apocalyptic number.

It is an amenable number.

57221497 is a deficient number, since it is larger than the sum of its proper divisors (143099).

57221497 is a wasteful number, since it uses less digits than its factorization.

57221497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143098.

The product of its digits is 35280, while the sum is 37.

The square root of 57221497 is about 7564.4892094576. The cubic root of 57221497 is about 385.3479667386.

The spelling of 57221497 in words is "fifty-seven million, two hundred twenty-one thousand, four hundred ninety-seven".