57221989 has 6 divisors (see below), whose sum is σ = 62897030. Its totient is φ = 52019880.

The previous prime is 57221981. The next prime is 57222007. The reversal of 57221989 is 98912275.

57221989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 55621764 + 1600225 = 7458^2 + 1265^2 .

It is not a de Polignac number, because 57221989 - 2³ = 57221981 is a prime.

It is a super-2 number, since 2×57221989² = 6548712050232242, which contains 22 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 (57221981) 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 5 ways as a sum of consecutive naturals, for example, 236334 + ... + 236575.

Almost surely, 2^57221989 is an apocalyptic number.

It is an amenable number.

57221989 is a deficient number, since it is larger than the sum of its proper divisors (5675041).

57221989 is a wasteful number, since it uses less digits than its factorization.

57221989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472931 (or 472920 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 57221989 is about 7564.5217297593. The cubic root of 57221989 is about 385.3490711642.

The spelling of 57221989 in words is "fifty-seven million, two hundred twenty-one thousand, nine hundred eighty-nine".